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Quick answers
Do I have to change my name when I marry?
Only if local law or household rules say so. Japan’s koseki has required one married surname; many other systems make change optional.
Is a deed poll enough everywhere?
The UK deed-poll path is not a universal solvent. U.S. states, Germany and Japan each have their own instruments.
Did immigrants gain by Anglicising names?
Biavaschi, Giulietti and Siddique found some historical U.S. earnings links after Americanisation — a description of a biased market, not a duty.
Will a new name erase the old one online?
Rarely. Data brokers and news archives keep the previous string. Plan for coexistence.
Is changing a child’s name easy?
Usually harder: both parents, a court, and a welfare test (explicit in German Namensrecht).
Does a nickname need a legal change?
Only when institutions that require the legal string will not honour a used-name field.
Compare instruments, not vibes. A U.S. common-law story will fail at a German Standesamt.
Household registers and court petitions are different worlds.
Regions
- United States — State petitions + marriage certificates
Uneven publication rules; generally possible for adults.
- England & Wales — Deed poll + usage
A well-known adult path; children are different.
- Germany — Namensrecht
High friction; welfare and public-interest tests.
- Japan — Koseki amendment
Family-register logic; marriage surname unity is the famous constraint.
- Iceland — Committee + grammar
A new given name may need list approval, not only a fee.
- Korea — Court permission (name change)
Adults can petition; family and frequency considerations appear in practice — not a luck test in this atlas.
Laws
- German Namensrecht Germany — Among the stricter European change regimes.
- Japanese Family Register Act Japan — The household file is the name.
- Icelandic naming committee Iceland — A new given name can be a linguistic case, not only an identity case.
- U.S. state name-change statutes United States — Publication, fees and felony exceptions vary.
Worldwide, the constant is the cascade: one new name, many old databases.