Japan Weighs Legal Status for Birth Surnames While Keeping Shared Family Name Rule

A legal identity at work, a shared surname in marriage

Japan is considering giving legal recognition to the surnames people used before marriage while keeping the requirement that married couples share one registered family name. The proposal would address a burden that falls mainly on women: government figures show that women changed their surname in 95.5% of marriages in 2019.

Justice Minister Takashi Yamashita said the government wanted to establish a legal basis for using a former surname and clarify where it could be used, instead of leaving it as an informal alternative name. The government has deferred submitting legislation during the current parliamentary session. The proposal had been expected around March, but no confirmed submission date has been announced.

The central choice is between two different reforms. One would give a person's birth surname wider legal recognition in everyday life while retaining a shared surname in the family register. The other would let couples choose to keep separate legal surnames after marriage.

Prime Minister Sanae Takaichi supports expanding the use of birth surnames to reduce everyday disadvantages. Supporters of optional separate surnames fear that this approach could leave the underlying requirement unchanged and weaken pressure for a broader reform.

What the proposed law would change

The proposed legislation follows an agreement between Takaichi's Liberal Democratic Party and its coalition partner, Nippon Ishin, also known as the Japan Innovation Party. Their approach would grant legal validity to original surnames across social life while preserving one official surname for each married couple.

National and local governments, along with businesses, would be required to accommodate the use of birth surnames under the proposal being prepared. The precise duties, the transactions covered and the relationship between the two names remain under consideration.

Japan's family register records legal family relationships and registered names. Under the existing marriage rule, either spouse can take the other's surname. An optional separate surname system would instead allow each person to retain their own legal surname, while couples who wanted a shared name could still choose one.

The practical difference matters when someone moves between work and official business. A woman might be known to clients under her birth surname but have another name on tax records or identity documents. Giving the first name legal recognition could make those interactions easier, although the government's chosen model would retain the registered surname shared by the couple.

Two decades of expanding former surname use

The Cabinet Office's Gender Equality Bureau documents a long series of administrative changes in its former surname policy review. National government employees gained permission to use former surnames in certain workplace documents in March 2001. In September 2017, that permission expanded to cover uses without particular legal or practical obstacles.

The government's Fifth Basic Plan for Gender Equality, approved by the Cabinet on December 25, 2020, committed to further expanding and publicising former surname use. It also called for continued examination of the rules governing married surnames, taking account of changing family arrangements, public views, court decisions and children's interests.

• March 2001: National government offices began allowing employees to use former surnames in specified workplace records.
• September 2018: Ministers were permitted to use former surnames for external legal acts, with exceptions including appointments as government representatives.
• 2019: Former surname entries expanded to nursing licences in January, residence records and My Number cards in November, and driving licences in December.
• April 2021: Passport requirements for adding a former surname were relaxed, with labels such as "Former Surname" added.
• September 30, 2021: The bureau listed 287 qualifications allowing former surname use, including some arrangements scheduled to begin later.

The bureau's June 2021 list had covered 263 qualifications. The September total was 24 higher, about a 9% increase. Both lists included some permissions with future starting dates, showing how expansion proceeded through individual administrative decisions.

Why two names still create problems

The Gender Equality Bureau also catalogued difficulties in its review of practical limits, drawing on public submissions, surveys and other responses. Its examples cover tax procedures, bank accounts, credit cards, travel, privacy and professional records.

Tax returns and tax notices use registered names, while acceptance of former surnames varies among banks and card companies. Someone whose employer accepts a birth surname may therefore still need a different name for financial and government transactions.

Employers also carry costs. Human resources and payroll departments may need systems that connect an employee's working name with their registered name. The bureau identified extra administrative work, the cost of changing systems and the risk of mistakes when identifying people.

Privacy is another concern recorded in the review. Changing a name or displaying both names can reveal a marriage or divorce. For people who prefer to keep family circumstances private at work, the requirement to explain two surnames can become a personal burden as well as an administrative one.

What changing a name means for a career

Akiko Saikawa, an office worker in Tokyo, described going through dozens of procedures after marriage, including changing her passport and other documents and updating social media accounts. She also had to tell employers that she wanted to continue using her maiden name at work.

Saikawa explained the disruption in these words:

It was very time consuming and inconvenient,

Researchers and other professionals can face a different problem: their reputation may be attached to the name under which they published papers, registered patents or built a business. The bureau's review records concerns about breaks in research records and career histories, as well as difficulties passing a business to the next generation.

Machiko Osawa, a professor specialising in labour economics at Japan Women's University, linked the paperwork to the treatment of women's professional achievements. She said:

Newlywed women have to waste so much time changing their names on banking accounts, credit cards, passports and all other official documents. And for those who have established themselves as professionals, being forced to change their name is a denial of what they have accomplished. It sows confusion and subordinates them to men,

Businesses press for a more consistent system

A 2022 Institute of Labour Administration survey found that almost 84% of companies allowed women to use their original surnames at work. That level of acceptance shows how widely workplace practice has moved towards preserving professional names, even as legal records continue to require a shared married surname.

International travel exposes the gap between the two systems. Masahiko Uotani, identified as Shiseido's chief executive when he spoke, described women executives being locked out of hotel rooms or denied admission to overseas meetings because the surname they used did not match their identification.

Uotani told a meeting of the Japan Business Federation:

The current system is becoming a barrier to career development for those who are internationally active,

The federation, known as Keidanren, backed the campaign for optional separate surnames and collected accounts of difficulties involving academic papers and business contracts. Its head at the time, Masakazu Tokura, called for implementation as a priority to support women's working lives.

The government's own review records the need to explain differences between a passport's registered name and a name used professionally. Adding a former surname to a document helps connect the two identities, while acceptance in a particular transaction still depends on the rules applied by the organisation handling it.

Why a recommendation from 1996 remains unresolved

A panel advising the justice minister recommended allowing couples to retain separate surnames in 1996. Conservative opposition prevented the proposal from becoming law. The shared surname requirement sits within a Civil Code framework dating to 1898, although the present rule allows a couple to choose either spouse's surname.

The Supreme Court upheld the constitutionality of the shared surname system in 2015 and again in 2021, while leaving reform to parliament. Couples challenging the rule have argued that it conflicts with constitutional gender equality because women bear almost all the burden of changing names.

Conservative LDP members have defended shared surnames on grounds of family unity and concerns about children. The 2020 gender equality plan included family cohesion and children's best interests among the matters to consider when examining reform.

The political caution predates Takaichi. During his premiership, Fumio Kishida called for further discussion to secure broad public support. Business groups, opposition parties and some LDP lawmakers have pressed for choice, but disagreements within the governing party have repeatedly slowed legislative action.

Parliament faces competing routes to reform

The Constitutional Democratic Party of Japan and the Democratic Party for the People each submitted bills for optional separate surnames earlier in 2025. The Lower House debated the issue for the first time in 28 years, bringing the broader reform back into parliamentary consideration.

Divisions within the LDP prevented it from producing its own legislation. The government proposal on birth surname recognition emerged as a different route, supported by the agreement with Nippon Ishin.

The LDP's minority position in the Upper House makes support beyond the party important to securing passage. Smaller parties, including Sanseito, could affect whether the government's proposal becomes law.

Supporters of optional separate surnames worry that wider recognition of birth names could become a political substitute for changing the marriage rule. Takaichi's approach focuses on reducing daily inconvenience while retaining a common registered family name. Parliament must decide which obligations to place on institutions and whether to change the surname requirement itself.

The personal choices behind the legal debate

The bureau's review records people describing the surname requirement as an obstacle to marriage, including concerns about preserving a family name and decisions to live together without registering a marriage. It also records feelings of lost identity after a name change.

Marriage and remarriage make the administration more complicated for some families. The review cites Ministry of Health, Labour and Welfare population statistics showing that about one in four marriages in the period it describes involved remarriage. It also identifies the possibility that a person may have more than one former surname.

Japan's low birthrate and shrinking population give debates about family life wider urgency. The concrete concerns recorded here involve the costs of marrying, keeping a professional identity and deciding whether to register a relationship.

For employees, businesses and public offices, the immediate issue is whether a familiar working name will be accepted consistently when money, identity or legal paperwork is involved. For couples seeking separate legal surnames, the issue goes further: whether marriage should require either partner to change their registered identity at all.

Key Points

• Japan is considering legal recognition of birth surnames while retaining the requirement that married couples share a registered surname.
• Women changed their surname in 95.5% of marriages in 2019, according to government figures.
• Administrative permissions have expanded since 2001, but government reviews still record problems involving taxes, banking, travel, privacy and careers.
• Almost 84% of companies surveyed in 2022 allowed women to use original surnames at work.
• Opposition parties submitted optional separate surname bills in 2025, reviving Lower House debate after 28 years.
• The government has deferred submission of its proposal during the current parliamentary session, with details still being considered.