1. (noun)nickname, moniker, cognomen, sobriquet, soubriquet, byname a familiarname 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"
Definitions of 'sobriquet'
Webster 1913 Dictionary
1. (noun)sobriquet an assumed name; a fanciful epithet or appellation; a nickname