I don't care for
Lottie either, now that you mention it! It comes out "loddy" in my accent, and seems precious since it's not shorter than
Charlotte, but only cuter. It's not as bad as
Charlie with a CH sound like
Charles, though. I guess I can stand
Charlie if it's pronounced with a SH. I agree that Char will not do, but it is shorter, and if a
Charlotte gets called that, it would be up to her to refuse it - same as a
Rachel can refuse to be addressed as "Raitch" or a
Diana can refuse to be addressed as "Die."