Etymology
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sobriquet (n.)

1640s, from French sobriquet "nickname," from French soubriquet (15c.), which also meant "a jest, quip," and is said to have meant literally "a chuck under the chin" [Gamillscheg]; of unknown origin (first element perhaps from Latin sub "under").

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Definitions of sobriquet

sobriquet (n.)
a familiar name for a person (often a shortened version of a person's given name);
Synonyms: nickname / moniker / cognomen / soubriquet / byname
From wordnet.princeton.edu