As others have said, bullying potential is high with Luna.
Also fairly high with Lana, backwards it's anal. Terribly juvenile I know but...children and teenagers are known for being quite juvenile. It's for this reason I'd never use Orla, despite thinking it's lovely.
My name is Luna. I love it, but it can be a bit of a cross to bear. As a child in a small, MC village primary school, I didn't like it. I wasn't bullied, but it was very different from everyone else, and I didn't want to be different.
As an adult, I am very comfortable in my own skin, and am different. Happy to be. People remember me always, and I think that a number of amazing opportunities have come my way, in part, because I have a memorable name, partly because I'm a confident and sociable person.
Lots of people tell me they love my name when I meet them. I wouldn't change it for the world now.