Why is the ninth month called September?
1620s, from Latin homonymus, from Greek homonymos "having the same name" (see homonym). Homonymy "quality of being homonymous" is from 1590s.
homonymous ho·mon·y·mous (hō-mŏn'ə-məs, hə-)adj.
Having the same name.
Relating to the same sides of a field of vision.