I think Ashley does go well if that's what you're liking. I like the suggestions of Sloane, Blaire, and Vanessa. Other suggestions: Jessica, Courtney, Aubrey, Avery, Lacey, Sydney.
Two of my sisters are named Whitney & Ashley so I think they go perfect together! (the rest of us are named: Amber, Sarah, Taylor & Abby, big family of girls.)
*Formerly peainthepod?* TTC since 1/1/2006. All cycles BFN! IUI's & IVF with no luck. Emergency surgery 11/07 due to hemmoraging cyst on left ovary. 3rd HSG showed complete blockage of right tube (the good side), endo/cysts/adhesion removal 11/11. New start for 2012! Surprise BFP 6/17/12, due 2/12/13. It's a boy!!! Baby Boy born on January 26, 2013.
Re: What names go with Whitney for a girl?
Delaney
Gabrielle
Hannah
I know twins named Whitney and Vanessa. I always thought those names went really well together.