The name 'Bratii' is an ancient Ukrainian male name that has a hypocoristic suffix -ій. It originates from a Slavic disyllabic name that includes the component -брат- (brother), similar to names like Bratyslav, Bratomil, and Dorohobrat. The name Bratii is mentioned several times in written records from the 15th century in the territory of the Moldavian principality. For instance, a document from 1411 includes a reference to Bratii the logothete, and in 1422, it mentions "to our faithful Sluzhe Bratii the logothete." There is also a patronymic name Ivaszko Bratievich dating back to 1419.In Poland during the 15th century, this name was represented as Braciej.
