Allystair \a-llys-tair, all(y)-stair\ as a boy's name is a variant of Alastair (Greek), and the meaning of Allystair is "man's defender".

The baby name Allystair sounds like Alystair, Allysdair and Allistair. Other similar baby names are Alysdair, Allyster, Allistir, Allastir, Alistair, Alaistair and Alltair.