The name Nona is a girl's name of Latin origin meaning "ninth". Nona and is often added to lists like Mystical Names and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Nona is a name sometimes given to the ninth child -- and so unlikely to serve that purpose today. Musical cred: the name of a song by Motley Crue.
Non was the mother of Saint David, the patron saint of Wales, and said to be a cousin of King Arthur.