Updated June 9, 2019 Share: Boy name origins & meanings Scottish : Defender of mankind; version of Alexander Boy name variations Alastair Alistair Alistaire Alastaire Alister Alaster Alasdair Alaisdair Alaistair Alaister Alasteir Alastor Aleister Allastair Allaster Allastir Allysdair Alystair