MacLean, also spelt McLean, is a Scottish Gaelic surname, Eóin being a Gaelic form of Johannes (John). The clan surname is an Anglicisation of the Scottish Gaelic "Mac Gille Eathain", a patronymic meaning "son of Gillean". Gillean means "the Servant of [Saint] John [the Baptist]"), named for Gilleathain na Tuaidh, known as "Gillian of the Battleaxe", a famous 5th century warrior.