I think Maeve works fine, and it’s more of a redhead name than Isla. I don’t think people will notice that Maeve/Mae and David sound similar, or that “Maeve from Maine” sounds weird. Isla doesn’t really suit her in my opinion, and Maeve is more popular anyways.
Yeah, I really think it is too. It's just these little uncertainties that stopped me from using it right away. Isla is nice and I actually prefer it more, I think it doesn't really suit the character nearly as much as Maeve does. Isla makes me envision more of a 'blonde' or 'burnett' type. Thanks.
If you don’t like the initials of their names put together (I’d like to point out it spells FML), may I suggest Isa? Or maybe, despite its commonality, Isabella? It’s your choice, but I think Isla doesn’t suit her. I can’t really put my finger on why.