also Mick, derogatory slang for "an Irishman," by 1856, from the nickname form of the common Irish given name Michael (q.v.). Micky is attested in U.S. slang for "an Irish boy or man" by 1858.
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Michael
masc. proper name, also the name of an archangel, from Late Latin Michael (source of French Michel, Spanish Miguel), from Greek Mikhael, from Hebrew Mikha-el, literally "Who is like God?" The modern form of the name was a learned form in Middle English, where the common form was Michel (also Mihhal,Mighel, etc.), from Old French. The surname Mitchell might be from the old pronunciation of Michael or in some cases it might be from Old English mycel "big."