Nonnah \n(on)-nah\ as a girl's name is a variant of Nona (Latin), and the meaning of Nonnah is "ninth".

The baby name Nonnah sounds like Nonna and Nonah. Other similar baby names are Oonah, Lannah, Annah, Norah, Donnay, Dannah, Donna, Nonnie, Hannah, Honna, Ioannah, Ioanah, Jannah, Jennah, Jonnae, Jonna, Kennah, Lonna, Monna, Monah, Nanna, Neenah, Nenna, Norna, Rionnah, Ronna, Sannah, Yoannah, Yoanah, Yoninah and Yonah.