What is a Mccoy?

A McCoy is a person who is a member of a McCoy family. As a surname, McCoy is a variant of McKay, an Irish andScots surname Anglicized from the Gaelic Mac Aodha, meaning "son of Aodha." Aodha is Gaelic for "fire" and was the name of a pagan fire god.
"The Real McCoy" has nothing to do with families and surnames. It is a slang phrase meaning "the genuine article", "the real thing."
a little girl name destinie mccoy she is so pretty she looks like a angel