COGNOMINA
COGNOMEN
surname, family name, cognomen, last name
(noun) the name used to identify the members of a family (as distinguished from each member’s given name)
nickname, moniker, cognomen, sobriquet, soubriquet, byname
(noun) 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”
Source: WordNet® 3.1
Noun
cognomina
plural of cognomen
Source: Wiktionary
COGNOMEN
Cog*no"men, n. Etym: [L.: co- + (g)nomen name.]
1. The last of the three names of a person among the ancient Romans,
denoting his house or family.
2. (Eng. Law)
Definition: A surname.
Source: Webster’s Unabridged Dictionary 1913 Edition