I dislike the Lewis way of spelling!
Louis looks much better!
Me too... dilemma! I would also pronounce Louis - Loo-ee, but Lewis as Lewis...

Maybe you could spell it Luis?
The meaning is Famous Warrior
The origin is Spanish
Notes: a form of Louis
Luis - Origin and Meaning of the name Luis at BabyNames.com

That way people will pronounce it as it's written, because it looks a little different to the "original" ways of spelling it?