Curious as to why you think Evangeline Belrose is all right, but Jeannalyn Margaret is too long. It is just that Jeannalyn Margaret looks longer? They both have the same number of letters, and Jeannalyn Margaret is actually 1 syllable shorter (5 in Jee-nuh-lyn Mar-gret in my accent as compared to 6 in E-van-juh-lyn Bel-rose).
I'm not getting on you or anything - I've just had other people say things like "I think such-and-such is too long but I really like ______." and their suggestion is just as long as what my original combo was! :o) I guess I'm trying to get around to asking: what makes a name too long? Number of letters? Number of syllables? Or just the way it looks?