I quite like
Holly.
Holden isn't a personal fave but it's not bad. I don't think the names are "matchy" in the way of being too similar to one another but I did notice that saying "
Holden and
Holly" aloud, with the vowel sound of
Holly being similar to that of the Salinger character's surname, Caufield, made my association to the novel even stronger.
I think your chosen middle names are very nice. Some other ideas for
Holly I was playing with recently...
Holly AbigailHolly DanielleHolly GuinevereHolly IsobelHolly JeanetteHolly MirandaHolly Winifred