I agree, regarding
Eloise and
Eloisa. I prefer
Eloise, and think it is highly usable. I used to prefer
Louisa to
Louise, but that was when it was more unusual, and a name that I only occasionally came across, outside the page of
Jane Austen's novels. Nowadays, it seems at least as popular as
Louise, and I currently adore
Louise. It was overused as a middle name, and I'm glad that it is being revived as a first name. It's classic and beautiful.