If you got Kathleen/Kitty and like Elizabeth/Betsy and Penelope/Penny it sounds like you like thing with little/informal and adult/formal options. A lot of those have ee endings but I've tried to think of some that don't too.
Wow...thank your for all your suggestions. Manicinsomniac your list is briiliant i love lots of them and many i hadnt considered. I love cutesy floral girly names but struggle to see them as adult bames sometimes and like a grown up version for safety! Love beatrix i think as trixie/ bea are both lovely and hopefully not too popular?
I have an Isadora nn Dora and love Katherine/Kathleen nn Kitty for another girl. Also on our list - Beatrice nn Betsy Primrose nn Posy Vivienne nn Vivi Tabitha nn Tabby Meredith nn Merry All "ee" endings I know but don't think it matters too much! Manicinsomniac LOVE your list I might have to add some of those to mine