[name_u]Kit[/name_u].
This has just struck me as an ADORABLE name for a little one. I know it is a NN for [name_m]Christopher[/name_m] ([name_m]Christopher[/name_m] “[name_u]Kit[/name_u]” [name_m]Harrington[/name_m], for example), but I feel like [name_u]Kit[/name_u] could work on a girl, as well.
My question: what longer/formal girls’ names do you think could be shortened to [name_u]Kit[/name_u]?
I love [name_u]Kit[/name_u]!
[name_f]Christina[/name_f]
[name_f]Caitriona[/name_f]/[name_f]Katrina[/name_f]
[name_f]Catherine[/name_f]
[name_f]Katrin[/name_f]
[name_f]Kirsty[/name_f]/[name_f]Kirsten[/name_f]
[name_f]Kristen[/name_f]
I have come across girls named [name_f]Katherine[/name_f]/[name_f]Kathryn[/name_f] who go by [name_u]Kit[/name_u] 
I also second the suggestions of [name_f]Kirsty[/name_f], [name_f]Kristen[/name_f], [name_f]Katrina[/name_f] and [name_f]Christina[/name_f]!
I think almost any name with a K/hard C start and a T in it could be nicknamed [name_u]Kit[/name_u]. [name_f]Katherine[/name_f] nn [name_u]Kit[/name_u] is the obvious choice, and I also like the other ideas above.
Some more suggestions:
[name_f]Callista[/name_f]
[name_f]Christabel[/name_f]/[name_u]Christobel[/name_u]
Kestrel
[name_m]Kester[/name_m]
[name_u]Nikita[/name_u]
[name_f]Kismet[/name_f]
[name_f]Keturah[/name_f]
[name_f]Ekaterina[/name_f]
[name_f]Crystal[/name_f]
[name_f]Clementine[/name_f] (sort of)
[name_u]Constantine[/name_u]/[name_f]Constantina[/name_f]/[name_f]Constance[/name_f]
[name_f]Kateri[/name_f]
[name_f]Kitana[/name_f]
I also think you could do a K(i) name with a T middle name.