I know a
Luna, a very focused and headstrong academic. The name doesn't seem to suit her at all. I also know a
Stella who always goes by her mn, and her granddaughter who goes by
Stella.
I really would never ever use
Luna or even think about it. It's much too close to 'loony' and 'lunatic'.
I like
Stella a lot and might have considered it if I had enough daughters; much nicer than
Sarah, for instance. But I like a lot of names better than
Stella, mostly for personal and family reasons.