The name Mccoy is a boy's name of Irish origin meaning "fire". Mccoy and is often added to lists like Attitude Names for Boys and discussed in our forums with posts like "Many, many multiples...".
From the experts:
One of numerous usable Irish and Scottish surnames starting with Mac and Mc, this is the real McCoy. McCoy Tyner, the well-known jazz pianist, is one of the few to use this very cool name. Bonus: Nickname Mac.