Allastir \a-llas-tir, all(a)-stir\ as a boy's name is a variant of Alastair (Greek), and the meaning of Allastir is "man's defender".

The baby name Allastir sounds like Allistir and Allaster. Other similar baby names are Allyster, Allystair, Allister, Allistair, Allaistar, Alastor, Alaster, Alasteir and Alistir.