Alastair is a common male first name.
Alastair is the Anglicised spelling of the Gaelic name Alasdair, which is a corruption of the Greek name Αλέξανδρος (Alexandros) (English: Alexander).
Variations of Alastair include:
Alastair, Alasdair, Alasdhair, Alasteir, Alastar, Alaster, Alastor, Alaisdair, Alaistair, Alaister, Aleister, Alester, Alistair, Alistar, Alister, Allaistar, Allaster, Allastir, Allistair, Allister, Allistir, Allysdair, Allystai...
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