The man who keeps the bar in a saloon.
1712. I am in the condition of the idol you was once pleased to mention, and bar-keeper of a coffee-house.Steele, Spectator, No. 534, 12 Nov., ¶ 5. (N.E.D.)
1803. I had advertised in the Baltimore Paper for the place of domestic Tutor, and one morning, while I was standing before the door of the city of Strasburgh, the bar-keeper brought me a note very carefully sealed.John Davis, Travels in the U.S.A., p. 330 (Lond.).
1834. No, said the barkeeper (so are these functionaries called).Caruthers, The Kentuckian in New-York, i. 59 (N.Y.).