Surnames in 1492: Iberian two-surname customs

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. Most people use -son or -dóttir from a parent’s given name. A few hereditary surnames exist, but they are not the default.

The koseki system has required married couples to share one family name, a rule long debated as a gender and identity issue. 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. A small set of surnames (Kim, Lee, Park…) is common; clans and regional bon-gwan further sort lineages. Given names do more distinguishing.