Hoy is a Scottish and Irish surname. The Irish origin of the name is derived from "Ó hEochaidh". Other surnames developed from "Ó hEochaidh" include: McKeogh, Kehoe, Hoey, Haughey, Haugh and Hough. Hoy is sometimes considered to be a variant of Haughey, and it is very common in Ulster. The first recording of the surname in Ireland is of one Elizabeth, daughter of Leuise and Martha Hoy, on 8 February 1646, at Holy Trinity (Christchurch), Cork.

People named Hoy include:

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