When I was a child (in the 1940s) a woman in the street was known to everyone as Tilly or Till Clark. Can anyone tell me what the name Tilly is short for or derived from?
It's also sometimes used a a shortened form of Laetitia, instead of Lettie (or, indeed, T*tty - rerad "SWallows & Amazons" recently?), but I'd say most commonly Matilda.
Following on from narolines' answer, I once knew a woman who had a daughter called Lavinia. She used to get fed up with people enquiring after her Lav.