Mccoy is a Scottish and Irish surname, from the Gaelic Mac Aodha, "son of Aodh", an old name meaning "fire". In America it recalls the Hatfield-McCoy feud of the 1880s and the phrase "the real McCoy", the genuine article. Mccoy has moved up with the trend for Mac- surnames: it entered the US top 1000 in 2020 and ranks number 806 in 2025, its highest rank yet.