Nouns

(n)nickname, moniker, cognomen, sobriquet, soubriquet, bynamea familiar name for a person (often a shortened version of a person's given name)“Joe's mother would not use his nickname and always called him Joseph”, “Henry's nickname was Slim”
(n)surname, family name, cognomen, last namethe name used to identify the members of a family (as distinguished from each member's given name)