I don't even know what you mean when you speak of a pronunciation difference.
It makes me think of
Blythe Danner, and
Blythe Danner always makes me think of "1776", which is one of my favorite movies, because she was in it, and so I kind of like it, though I'd never use it.
It's utterly ridiculous as a middle name for a boy. Please don't do that if you ever have a son. I've known people who refuse to divulge their middle names, but I bet my bottom dollar none had as bad a middle name as
Blythe for a male.