Domhnall mac Alasdair was a son of Alasdair Mór mac Domhnaill, and a member of Clann Domhnaill.
Domhnall is attested by the fifteenth-century manuscript National Library of Scotland Advocates' 72.1.1 (also known as 1467 MS and 1450 MS).
[2] He may be identical to Domhnall of Islay.
[3] The latter's attestations suggest that he was a contestant to the Clann Domhnaill lordship,[4] and may have possessed the chiefship.
[5]