Boris, Borys or Barys (Bulgarian, Russian, Serbian, ; ) is a male name of Bulgar origin, an extinct Oghur Turkic language. It is most commonly used in Russia, Belarus, Ukraine, Bulgaria, Serbia, Bosnia and Herzegovina, Croatia, North Macedonia, Montenegro, Slovakia, Slovenia and other countries in Eastern Europe. The spelling variant Borys is more common in Poland. Meaning A commonly accepted theory is that it is a Bulgar language name. Its precise etymology is unclear. It may be derived from one or more of several Turkic words such as böri – meaning "wolf", or from bogöri – which means "short", or from bars – meaning "snow leopard". It can be used as a short form of the name Borislav, derived from the Slavic elements borti "battle" and slava "glory", "fame". Through the nickname "Bob" the name is often linked together with the name Robert, an ancient Germanic name meaning "fame-bright". Origin Boris is first found in written records in the case of the Bulgarian ruler Knyaz Boris I (852–889), who adopted Christianity in AD 864 and introduced it to his people. His name came to be known in Europe in relation to this particular act. Moreover, after his death in AD 907 he was proclaimed the first Bulgarian saint, and traces of his Orthodox sainthood during this period can be found as far away as Catholic Ireland. The Patriarchate of Constantinople recognized the canonization of St. Boris in AD 923. Prince Boris was purportedly not a Slav and descended from the Bulgars. Among the Bulgars the name was known in its two forms: Boris and Bogoris. History Boris started its worldwide spread with its adoption by Rus' Slavs from the First Bulgarian Empire. Bulgarian cultural missions intensified in the 10th century, during the reign of Tsar Petar and with them the spread of Bulgarian culture to what would become Ukrainian and Russian lands continued. It is speculated that the name of the Bulgarian saint Tsar Boris I reached the Rus in the late 10th century, likely during the reign of Boris II of Bulgaria (969–977), great-grandson of Boris I. In 967 the Byzantines instigated the Rus to attack the First Bulgarian Empire and it is probably around this campaign that the marriage of Vladimir I of Kiev to a Bulgarian noblewoman, who is assumed to be a daughter of Peter I, i.e., sister of Boris II, was arranged. One of the