Alaisdair \a-lais-dair, ala(i)-sdair\ as a boy's name is a variant of Alastair (Greek), and the meaning of Alaisdair is "man's defender".

The baby name Alaisdair sounds like Alasdair, Alaistair and Alisdair. Other similar baby names are Alysdair, Allysdair, Allistair and Alistair.