Alistair \a-lis-tair, al(i)-stair\ as a boy's name is of Greek origin, and the meaning of Alistair is "man's defender". Scottish spelling of Alasdair, the Gaelic form of Alexander, which has long been popular in Scotland, having been borne by three medieval kings of the country. Aly is the pet form. TV commentator Alistair Cooke; actor Alistair Sim.

Alistair has 8 variant forms: Alastair, Alastor, Aleister, Alisdair, Alistaire, Alister, Allister and Aly.

For more information, see also related names Allaster and Macallister.

Baby names that sound like Alistair are Alystair, Allistair, Alistar, Alaistair and Alistir.