Alastor \a-las-tor, al(a)-stor\ as a boy's name is a variant of Alastair (Greek) and Alistair (Greek), and the meaning of Alastor is "man's defender".

The baby name Alastor sounds like Alaster, Alyster, Allastir, Allaster, Alister, Alistar, Alester, Alaister, Alasteir, Alistir, Alston and Allston. Other similar baby names are Alasdair, Alystair, Allyster, Allistir, Allister, Allaistar, Aleister, Alaistair, Allstonn, Alstin, Alsten, Alsdon and Alter.