Introduction. The article offers a historical-linguistic analysis of all known historical variants of the modern oikonym Belgorod-Dniestrovskyi of the Odesa region: Tira, Belgorod, Aspron, Akja Kermen, Asprokastro, Chetatya Albe, Moncastro, Mavrokastro, Albi Kastri, Akkerman. The connection of each name with the corresponding period of the ethnic history of this region is traced — ancient Greek, East Slavic (ancient Ukrainian), Turkic (Tatar), modern Greek, Moldavian (East Romansh), Venetian-Genoese, Turkish, Russian. Purpose. The author carried out a structural-semantic and etymological analysis of the creative bases of the historical variants of the modern oikonym Belgorod-Dniestrovskyi of Odesa region: Tira, Belgorod, Aspron, Akdja Kermen, Asprokastro, Chetatya Albe, Moncastro, Maokastro, Mavrokastro, Albi Kastri, Akkerman and also traced the connection of the internal form of the specified names with the corresponding stages of the ethnic history of the studied region. Object of study. Historical variants of the modern oikonym Bilhorod-Dnistrovskyi: Tyra (Tyra), Bѣlъgorodъ, Aspron (’Άσπρoν), Akja Kermen, Asprokastro, Chetatya Albe, Moncastro (Monchastro), Maocastro (Maocastro), Mavrocastro (Maurocastri), Albi Castri (Albi Castri), Akkerman (Акъ-Керменъ, Akierman). Research methods. Methods of analysis of historical variants of the oikonym Bilhorod-Dnistrovskyi: the descriptive method: the word-forming structure of the given variants is described; the comparative-historical method, by means of which the creative bases of the specified names within the related Indo-European languages are characterized; the comparative method: a systematic comparison of genetically Indo-European names (Greek, Latin, Eastern Romansh, Slavic) with their genetically Turkic (Tatar and Turkish) counterparts; the method of etymological analysis: the etymons of the corresponding oikonymous variants are determined. Research results. The connection between the oldest name of Bilhorod-Dnistrovskyi — Tira and the corresponding archaic name Dniester has been established. The author assumes its evolution from the Pre-Iranian (Indo-Aryan) form tīvrā, and substantiates (with the involvement of a wide range of related names) the ProtoSlavic archaic of the ancient Ukrainian name Bilhorod ’ Бѣлъгородъ. Therefore, most of the other variants were formed as corresponding semantic loans (Tatar, Modern Greek, Moldavian (Eastern Romansh), Turkish) of the ancient Slavic name Бѣлъгородъ. Conclusions. The historical-linguistic analysis of the historical variant names of the modern oikonym Bilhorod-Dnistrovskyi — Tira, Бѣлъгородъ, Aspron, Akja Kermen, Asprokastro, Chetatya Albe, Moncastro, Maokastro, Mavrokastro, Albi Castri, Akkerman — proves the connection between the linguistic history of the analyzed variant names and the corresponding ethnic history of the studied region.