An assimilated form of earlier gig, from Middle English gigge, from Old French gige, gigue (“a fiddle, kind of dance”), from Frankish *gīge (“dance, fiddle”), from Proto-Germanic *gīganą (“to move, wish, desire”), from Proto-Indo-European *gheiǵh-, *gheigh- (“to yawn, gape, long for, desire”). Cognate with Middle Dutch ghighe (“fiddle”), German Geige (“fiddle, violin”), Danish gige (“fiddle”), Icelandic gigja (“fiddle”). More at gig, geg.
From
Wiktionary
Probably shortening of jigaboo
From
American Heritage Dictionary of the English Language, 5th Edition
Origin unknown
From
American Heritage Dictionary of the English Language, 5th Edition