It's not associated with the lake here in Sweden though. :) It's very associated with the book character, but it's also a common name for children/teens. I'd say it's a modern name .
I like
Ronja and prefer this spelling.
We’ve all got both light and dark inside us. What matters is the part we choose to act on. That’s who we really are.
PNL: http://www.behindthename.com/pnl/45898
Top rated: Alice and William
Bottom rated: Dolly and Zeus