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Etymology

It is believed the name was brought to the region in the 7th century by Bulgars who applied it to the area, as a part of the First Bulgarian Empire. In Bulgarian, the archaic word balkan (балкан) was borrowed from Turkic and means "mountain". It may have ultimately derived from the Persian bālkāneh or bālākhāna, meaning "high, above, or proud house." The name is still preserved in Central Asia with the Balkan Daglary (Balkan Mountains) and the Balkan Province of Turkmenistan.

In Antiquity and the Middle Ages the mountains were known by their Thracian name: the Haemus Mons. Scholars consider that the name Haemus (Αἷμος) is derived from a Thracian word *saimon, 'mountain ridge'. The name of the place where the range meets the Black Sea, Cape Emine, is derived from Aemon. A folk etymology holds that 'Haemus' derives from the Greek word "haima" (αἵμα) meaning 'blood', and is based on Greek mythology. During a fight between Zeus and the monster/titan Typhon, Zeus injured Typhon with thunder; and Typhon's blood fell on the mountains, which were then named for this battle.

Other names used to refer to the mountains in different time periods include Aemon, Haemimons, Hem, Emus, the Slavonic Matorni gori and the Turkish Kocabalkan.