Yes, I like Orla too. Also like Isla, very pretty when pronounced correctly. I say this as I taught a girl whose parents pronounced it Is-la which just isn't as pretty IMO.
Also, Lana and I quite like Jean. It sounds old fashioned but I know a 5yr old called Jeanie and it's lovely. Or Lola?
Oh how about Suki? (is that how you spell it? Pronounced Sooky) That's short but quirky.
Lexie? You could go with Alexis or Alexandra and shorten it to Lexie.