Alistair is a male given name. It is an Anglicised form of the Scottish Gaelic name Alasdair. The latter is most likely a Scottish Gaelic variant of the Norman name Alexandre or the Latin name Alexander, which was incorporated into English in the same form as Alexander. The deepest etymology is the Greek Ἀλέξανδρος (man-repeller): ἀλέξω (repel) + ἀνήρ (man), "the one who repels men", a warrior name. Another Anglicisation of Alasdair is Allaster.