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

The baby name Allyster sounds like Alyster, Allister and Allaster. Other similar baby names are Allystair, Allistir, Allastir, Alister, Alester, Aleister, Alaister and Alaster.