My daughter called herself Gretel for a week a while ago after becoming completely obsessed with the Sound Of Music. I had to call her Gretel or suffer the whines
The good thing was that I really liked the name! I found myself calling after her in the street once or twice and it felt really nice to use such a lovely girl's name.
People in the local neighbourhood and at her Kinder where she had a substitute teacher really thought her name was Gretel! I think I would consider using it if I ever had another girl.

Other than that, I like some of the other names in the Sound of Music like Liesel. It was on my list for DD2 (Natasha)

I also like variations on Natasha like Natalia.

Other suggestions I like are Felicity, Freya or Frieda (I think they sound like fairies!)
or Molly, Heidi or Holly.

Oh, I love picking names!