Mainz has a number of different names in other languages and dialects. In Latin it is known as Mogontiacum or Moguntiacum and, in the local West Middle German dialect, it is Määnz or Meenz. It is known as Mayence in French, Magonza in Italian, Maguncia in Spanish, Mogúncia in Portuguese, Moguncja in Polish, Magentza (מגנצא) in Yiddish, and Mohuč in Czech and Slovakian.
Before the 20th century, Mainz was commonly known in English as Mentz or by its French name of Mayence. It is the namesake of two American cities named Mentz.