* As a French, English, Jewish, Dutch, Polish, Russian, Czech, German, Spanish (Barón), Romanian, Serbo-Croatian, and Breton surname, all from the noun baron. Compare Barron, Lebaron.
* Also as a French surname, from several places in France Le Baron.
* As an Italian (Veneto) surname, variant of Barone.
* Also as a Czech surname (Baroň), from a pet form of Bartoloměj.
* As an Irish surname, Anglicized from Ó Bearáin; see Barnes.
* General Slavic surname: Anglicization of Polish Baran (“Aries”), Ukrainian Баран (Baran), etc.