Hi
Leona,
Ronja is a name invented by the Swedish author
Astrid Lindgren for her book "Ronja Rövardotter" - English translation: Ronia, the Robber's Daughter:
http://www.amazon.com/gp/reader/0140317201/ref=sib_dp_pt/103-4937887-2190248#reader-link
Astrid Lindgren was searching for a name for her main character, looked on a map of northern Sweden and found the
Sami name of a lake "Juronjaure". She cut off "
Ju-" and "-ure" and had invented a new name!
Regards,
Satu