Bia, meaning food, is the root of many words in Gaelic and several surnames. In ancient and mediaeval Ulster strangers and travellers were granted hospitality. Each district would have a 'biatach' who was the man intrusted by the clan's taoiseach with the responsibility of providing this hospitality. This was done at the Brú, which was a hostel located at a road crossing on a major slí, or road. The position of biatach was important and he would be provided with land and goods so that he could execute his work. In short, it was a good gig.
The word biatach is used in several traditional family surnames: Ó Beataigh (descendant of the Biatach) which is anglicised as Beatty, Beattie. Another surname from Biatach is Mac an Bhiataigh (son of the Biatach) and anglicised as MacVitty, McVitie, etc. (so there is some connected between those lovely tea biscuits and their name!).