Cognomen has 3 different meanings across 1 category:
Noun
Noun
1
a 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"
2
the name used to identify the members of a family (as distinguished from each member's given name)
Broader Terms (hypernyms)
Narrower Terms (hyponyms)