The article is devoted to the study of the functioning in the Hungarian onomastic space of ethnonymic proper names originating from the North Caucasian and other ethnic groups, which contacted the Magyars in different historical epochs. The study examines the origin of Hungarian anthroponyms and toponyms, including hodonyms, particularly those connected with the ethnonym Cserkesz (Circassian), but also Kuns, Khazars, Bulgarians, etc. Such anthroponyms as Cserkesz, Karacsay, toponyms Nagycserkesz hamlet, Cserkesz wasteland, Cserkesz street are considered diachronically. The author notes the phonetic similarity of the ethnonym cserkesz (Circassian) and the lexeme cserkész (scout; formerly – forester, fisherman’s assistant). The article analyses the complex dynamics of ethnic and linguistic contacts manifested through onomastics, and highlights the importance of these proper names as part of Hungary’s cultural heritage. It is stated that Hungarian researchers, beginning with Count Jenő Zichy and Gábor Bálint, have explored possible historical, linguistic, and ethnocultural connections between the Hungarians and the peoples of the Caucasus – through similarities in surnames, toponyms, and theonyms (such as Isten) – proposing various hypotheses about their Caucasian, Iranian, or other origins, which was also reflected by V. Abaev.