- 姓 — surname; family name
 - 姓名 — full name
 - 同姓 — same surname
 - 旧姓 — former surname; maiden name
 - 百姓 — peasant; farmer (historical/common)
 
姓 pairs the woman radical 女 with the sound/meaning element for “birth” (生 → セイ). It points to family lineage and the inherited family name. In modern use it simply means “surname,” as in 姓名 “full name.”