Alistair is a masculine given name. It is an Anglicised form of the Scottish Gaelic Alasdair. The latter is most likely a Scottish Gaelic corruption of the Norman French Alexandre or Latin 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, not nearly so common, Anglicization of Alasdair is Allaster.
