What do McCoy mean? ?

Question

Do you know? I really want to know, What do McCoy mean?

Answer 1

as far as i know it's just a name-----last name

Answer 2

McCoy Name Meaning and History

Irish (Limerick): Anglicized form of Gaelic Mac Aodha ‘son of Aodh’, an ancient personal name meaning ‘fire’, originally the name of a pagan god. Thus it has the same origin as McGee, McKay and McKee.  

Answer 3

I believe the expression is the real McCoy, meaning that the object is genuine.  The expression most likely came from Elijah McCoy, a black inventor, most known for invention of locomotive lubricant, but their are other theories as well.