Meaning and Name Origin
Alasdair \a-las-dair, al(a)-sdair\ as a boys' name (also used as girls' name Alasdair) is pronounced AL-as-dare. It is of Greek origin, and the meaning of Alasdair is "man's defender". Scottish Gaelic form of Alexander, often anglicized as Alistair.
For more on this name, see also the related boy name Alastair.
Alasdair is an uncommon first name for males and an equivalently unique surname too for both adults and children. (2000 U.S. Census)
Displayed below is a comparison of the usage of Alasdair and affiliated names. Prominent variation forms of Alasdair (#unlisted) ranked in the Top 1000 are Alexander (#8 in 2014) and Alistair. These boy names were at the top of their popularity in the year 2009 and have remained as popular to this day. Alexander (#8) is the most contemporarily stylish name for newborns here, with this name having a rebound in popularity. (2014 Birth Statistics)