Lettie

I think it’s cute :) I have a family member called Violet and she uses this as her nickname, probably not something I would choose however.

Lettuce.

It's adorable. It works nicely as a nickname for Lettice (leh-TEES, not "lettuce" even though I believe that used to be the pronunciation back in the day), Leticia or Letitia or even Juliet or Violet.

This is my name (well, it's actually Letitia, but I've been called Lettie by everyone my entire life so...)
I like it, but it grates my ears to hear it slurred the way Americans do. It makes it sound like Leddy, which sounds weird. The ts should be nice and crisp.
Nice having a unique name, but can be a pain with telling people it. In America they always assume I'm saying Betty or something and in England they always assume I'm saying Lottie.

I like it as a nickname for Juliet.

This sounds cute, but only as a nickname. I think it makes a much nicer nickname for Leticia than the trashy Tish does.

I like this as a nickname, but not for Lettice; I think it would be better for the names Arlette and Charlotte.

I really like this name, it sounds very sweet. I like it much more then the names it is derived from (Lettice/Leticia/etc).