Where does “Blair” come from?

Blair comes from Scottish Gaelic blàr, from Old Irish blāro-s, from Proto-Celtic blā, ultimately from Proto-Indo-European roots bʰel- and bʰleh₃-.

Ancestry of “Blair”, step by step

Step	Language	Word	Meaning
1	Scottish Gaelic	blàr	battle, uproar; battlefield, field; moss
2	Old Irish	blāro-s	—
3	Proto-Celtic	blā	—
4	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
5	Proto-Indo-European	bʰōl-	—

Blair — Etymology, Origin & Word History | Etymology Explorer