Allaster \a-llas-ter, all(a)-ster\ as a boy's name is of Scottish origin. Variant spelling of Alistair. Borne by a minstrel in Sir Walter Scott's "Rob Roy" (1818), which made it popular in the 19th century.

For more information, see also the related name Alastair.

Baby names that sound like Allaster are Allyster, Allister, Allastir and Alaster. Other similar baby names are Alyster, Allistir, Allaistar, Alister, Alester, Aleister, Alaister, Alastor and Alasteir.