Usage: Swedish, Finnish, Danish, Norwegian, EnglishPronounced: YUWN-na (Swedish, Norwegian), YON-nah (Finnish), YO-na (Danish), JAHN-ə (American English), JAWN-ə (British English)Meaning: Scandinavian short form and English variant of Ioanna (see JOANNA).
I really think this name is a bit too youthful for grown-ups. It's very common in my age group (I was born in 1985), and women named Jonna are going to wish they had a more mature name by the time they're 40, I'm sure.