le-TISH-a
A distant cousin of mine was
Leticia (with a C)
Muriel. She always went by
Muriel, though she had a boss once who called her Tish. Tish sounds good to me, if a tad sneezy, but I really couldn't face
Letty as a nn.
I like
Letitia Rosalind!
Alice doesn't work so well, and though I usually love
Marianne, perhaps
Margery would be lighter? I'd also like
Letitia Suzanne.