Meaning and name origin
Alastair \a-las-tair, al(a)-stair\ as a boy's name (also used as girl's name Alastair), is of Scottish and Greek origin, and the meaning of Alastair is "man's defender". Scottish variant of Alistair, from Alexander. Most of the variants are different phonetic spellings of the name. TV commentator Alistair Cooke; actor Alistair Sim.
Alastair has 26 variant forms: Al▼, Alasdair, Alasteir, Alaster, Alastor, Alaisdair, Alaistair, Alaister, Aleister, Alester, Alistair, Alistar, Alister, Allaistar, Allaster, Allastir, Allistair, Allister, Allistir, Allysdair, Allystair, Allyster, Alysdair, Alysdare, Alystair and Alyster.
Alastair is not a popular first name for males and an equally uncommon surname or last name for all people (2000 U.S. Census).
Displayed below is a comparison of the popularity of the boy name Alastair and its variant forms. Popular variation forms ranked in the Top 1000/100 are Alexander (#8), Alistair and Al. (2014 statistics).