Mackey is an Irish surname.
It is derived from the Gaelic Mac Aoidh meaning 'son of Aodh', a variant of the Scottish and Irish McKay.
[1][2] In Ireland the name is also derived from to Ó Macdha 'descendant of Macdha', a given name meaning 'virile, manly', and may be anglicised as such.
[3] The surname Mackey has occasionally been used as a given name.