The name "Brat" is an ancient hypocoristic variant of the two-root Old Slavic name, such as Bratomyl, Zhelybrat, Sulibrat, which is still used by Bulgarians, Macedonians, Serbs, and Croats. In the southern slopes of the Ukrainian Carpathians, a Latinized variant of the name "Brat" was recorded in 1213 in the Varadins' registers, where the court bailiff is referred to as Bratus. There is a suggestion that this name may be related to the Ukrainian "Bratus," which was found in Poland from the beginning of the 15th century as Brath.Records of anthroponyms related to serfs were recorded in 1219: Zobozló, Borathe, Henuc in the Borsod county. Another record from 1419 mentions the nobleman Mykhailo Bratfra, and also the nobleman Andrii Bratkh, dated 1548-1550. In 1715, the parish priest Fedir Bratya was noted.The name "Brat" also became known among the Cossacks of the Zaporizhian army, where individuals named Brat were prominent, including Klymko Brat and Yarema Brat. Among Bulgarians, Macedonians, and Poles, this name was used in the form "Bratuž." Notably, there is also the toponym "Dorobratovo" in Transcarpathia.