So does this mean you have a boy's name picked out? I love it when boy/girl twins have the same first letter (not rhyme). I always liked Owen & Olivia, Spencer & Sydney, Gage & Gracie, Mason & Makenzie, Parker & Paige, etc.
All of the names are really pretty, but, I personally could never use the name "Avery". About 30 years ago, when I was in 4th or 5th grade, there was a boy in my class with the name "Avery". He was always in trouble - I can still hear the teacher yelling his name.
I voted for Macy Marie, based on the fact that I think the two names go together better than any of the other choices. Most of them are too wordy and have too many syllables when you put both names together. I like some of the other first names better, but not with the middle names chosen.
I voted for Avery Rachel. I think its pretty, different, but not odd. Avery is a really cute name. Im not as crazy about the middle name though. Why not Avery Grace?
I like Evelynn, but why not use the more common spelling, Evelyn? I don't care for Sydney particularly. I also like Grace. Gracie would be fine as a nickname, but I wouldn't give it as a name.
Evelynn Sydney was next (my nieces are Evelynn Elizibeth and Sydney Patricia).
I think all the combos have nice names - don't think all the combos "go" together.
I think some people on this thread are just plain RUDE, too. What one person finds melodious to the ears, another may not.
None of these names will be detrimental to a kid. All will grow up well.