[name_f]Love[/name_f] love love your kids names! [name_m]Knox[/name_m] sounds a but harsh with the flow of the other names, though it is cool. Seems more of a boy name in my opinion. [name_f]Vista[/name_f] fits in well with the other girls names.
Some other ideas: [name_m]Viren[/name_m], [name_f]Haven[/name_f], [name_f]Joyce[/name_f], [name_f]Starla[/name_f], [name_f]Zella[/name_f], [name_f]Fawn[/name_f], [name_f]Bria[/name_f].
I like other posters suggestions of [name_f]Bindi[/name_f], [name_f]Tawny[/name_f], [name_f]Twyla[/name_f], [name_f]Xanthe[/name_f], [name_f]Fable[/name_f], & [name_f]Juno[/name_f]