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The author, Astrid Lindgren, got the name from a lake, Juronjaure. Of course Astrid wasn't the one who created the name, but it's thanks to her the name has become so popular here in Sweden. It's very popular here and has been for years but I don't know someone personally with the name, but there was a girl in my old school named that.
I don't think Ronja needs a nickname.
Of yours I like Ronja Sofia and Ronja Cecilia.