I'll try
Isabelle on him and see if he likes it. I do prefer the spelling
Isabel (oddly enough I first started out only liking the spelling
Isabelle and not
Isabel) but he might like
Isabelle better, as it's more familiar.
I like
Mary as a middle name but the reason I want to use
Maria so much is that my mother's middle name was
Marie and
Maria is closest to to
Marie. I don't mind
Marie, even if it is a filler middle name. But I don't think I'd ever use it unless the first name I chose was more unusual to balance it out.
"I used to be Snow White, but I drifted."
Mae West