*Sorry, but isn’t this a bit of a non-name? Kit?
Kit-kat; tool kit, camping kit, kit car?
Why do people think this is “posh?” It’s one of those names like, Biff, Kip, Chip that you think must be nicknames or names for pets.
I know there’s Kat / Cat for girls but at least that’s short for Catherine*
You know it's short for Christopher, right?
It's nothing like Kip, Chip etc. It's a bona fide diminutive and the reason people think it's posh is because it tends to be posh people who shorten Christopher to Kit rather than Chris.
I know a Kit (Christopher). He's a super posh diplomat.