Asher,
Anthony and
Annabelle are all great names! I think if you really like a name, you should just use it. I don't like the idea of actually
striving to make all your kids name 'match' by having the same initials or whatever, but if that's what ends up happening due to the names that you like, then so be it.
And I don't think that the 4th child in a sibset with all A's would feel left out - to be honest, they would probably never notice the difference! As long as you loved their names as much as
Asher,
Anthony and
Annabelle, and had chosen it because of this, there really is nothing to complain about.
Do you know what you are having yet?
Can I guess a girl, because your ticker is pink, or is that a coincidence?