From the Celtic Biatach. Anciently, in Ireland, lands were assigned by the government to a certain number of persons who were appointed to keep houses of entertainment, and to exercise hospitality in the different provinces; they were called Biatachs. The office was considered honorable, and besides the lands assigned by the king, they were the lords of seven boroughs or villages, feeding seven herds of one hundred and twenty oxen each, besides the grain raised from seven ploughs every year. Beathaich, in the Gaelic, signifies to feed, nourish, to welcome, to support. "Beata mor," Irish, to have a great estate. Beatha, Gaelic, life, food, welcome, salutation.

Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.