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First name origin & meaning:

Scottish: Defender of mankind; version of Alexander

First name variations: Alistair, Alistaire, Alastaire, Alister, Alaster, Alasdair, Alaisdair, Alaistair, Alaister, Alasteir, Alastor, Aleister, Allaistar, Allastair, Allaster, Allastir, Allysdair, Alastair