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Quick answers
Are surnames older than given names?
Usually the opposite: personal names are ancient; frozen hereditary surnames spread later and unevenly.
Why do Spanish names have two surnames?
Children typically take one surname from each parent (order rules have evolved). A form with one “last name” box loses a lineage.
Does everyone in Iceland share family surnames?
Most people use -son or -dóttir from a parent’s given name. A few hereditary surnames exist, but they are not the default.
Why is Japanese surname law famous?
The koseki system has required married couples to share one family name, a rule long debated as a gender and identity issue.
Do surnames trend like baby names?
Much more slowly. Lieberson’s fashion engine is mainly about given names; surnames move with migration, marriage and law.
Can a surname signal ethnicity to employers?
Yes. Audit studies often vary first names, but last names also carry group information — the Emily/Lakisha design is part of a wider signal literature.
If you only remember three facts from this atlas, remember Spanish two surnames, Icelandic patronymics and Japanese koseki unity.
Add Korean surname concentration and Chinese generation practice on the given-name side to complete the set.
Regions
- Spanish-speaking world — Two surnames
Father’s and mother’s family names in a legally specified order (rules have changed).
- Iceland — Patronymics
A last element that points to a parent, not a frozen house.
- Japan — Koseki surnames
Household register and usually one married surname.
- Korea — Few surnames + bon-gwan
Shared family names, finer clan geography; given names distinguish.
- Russia & parts of Eastern Europe — Gendered surname endings
Morphology marks sex on the family name itself.
- English-speaking settler states — One hereditary surname
The form that global software still assumes.
Laws
- Spanish civil-code surname rules Spain & many LATAM states — Transmission and order of two surnames.
- Icelandic personal names act Iceland — Patronymics as the normal last element.
- Japanese Family Register Act Japan — Household surname unity — high legal friction.
- German Namensrecht Germany — Marriage and child surname options are coded in detail.
Worldwide surnames are a museum of state projects. Walk through; do not flatten.