From a presumed derivative of the base of ginosko (compare oninemi); a "name" (literally or figuratively) (authority, character) -- called, (+ sur-)name(-d).
see GREEK ginosko
see GREEK oninemi
ὄνομα (onoma) − 105 Occurrences
ὀνόματά (onomata) − 11 Occurrences
ὀνόματι (onomati) − 95 Occurrences
ὀνόματός (onomatos) − 17 Occurrences
ὀνομάτων (onomatōn) − 2 Occurrences