[Opinions] I have some rather unkind opinions. I apologize in advance.
Aquarelle sounds like a toothpaste to me, and Lemman is too much like Lemon! Imagine the teasing!
I'm sorry, but no matter what the meanings, I dislike them both a lot!
How about:
Aquara
Aquamarine
Aquamarina
Aquelle
Lennon
London
Lennox
Landon