Quilty is an Irish family name which has spread throughout the English-speaking world. ==Origins and history== The name `Quilty` is an Anglicized form of the ancient Gaelic name of `Caoilte` (pronounced: Kweelteh). There was a mythic Celtic warrior (c. 3rd Century A.D.) by the name of Caílte mac Rónáin, who was a member of the Fianna and th...