The name is recorded in two variants, Greek
Ούπταρος (Ouptaros), and Latin
Octar. The change from
-ct- to
-pt- is characteristic of Balkan Latin.
Otto J. Maenchen-Helfen considered the name to be of unknown origin.
Omeljan Pritsak derived the name from
Turko-Mongolic word
*öktem (strong, brave, imperious; proud, boastful; pride) and verb
ökte- /
oktä- (to encourage). He argued that the deverbal Turkic-Mongolian suffix
m was replaced in Turkic by
z while in Mongolian by
ri. The reconstructed form is appellative
*öktä-r. ==History==