The name may also derive from Mac a'Bhiadhtaigh, from biadhtach, "one who held land on condition of supplying food (biad) to those billeted on him by the chief". In the rest of Ireland, the name Biadhtach (Betagh; "public victualler") was changed to Beatty.

DNA testing on a Baty of Cumbrian descent has found close matches with others bearing the following surnames: Beatty; Beattie; Beaty; Baity; Beattey; Batey and Bates.

The surname Beatty can refer to:

See the Beatty Project 2000 website