When a name doesn't naturally lend itself to an altered form as a nickname, people have a tendency to simply shorten it as a note of intimacy. Thus, one often hears "Mare" for "Mary." With Leslie, I most often have heard "Les," though I suppose "Lee" might due; although I have personally never heard it used for Leslie. (For some reason, in my mind such might seem more appropriate for men with that name than women, though far fewer men are named Leslie than previously. Leslie was originally male but once people started to name girls that, then its desirability for boys diminished. That seems always to be the way. Seldom if ever will parents name a boy with a traditionally female name. Names that have changed genders almost always go the opposite way.)
In Thai, the name Leslie is spelled as เลสลี่.
Leslie French was a British actress who stood at around 5 feet 5 inches tall.
It's not French
The name Leslie in Japanese can be written as レスリー, which is typically pronounced as "Resurii."
셰인 레슬리 (shye-in le-seul-li)
Leslie Reese goes by Les.
Leslie Pearce went by Billie.
Leslie Moonves goes by Les.
Leslie Easterbrook goes by Bunny.
Leslie Ivarson goes by Punkmom.
Leslie Gilliams goes by Les.
Leslie Herman goes by Hermanator.
Leslie Bohem goes by Les.
Leslie Bonano goes by Les.
Leslie Carney goes by Carney.
Leslie Bricusse goes by Brickman.
Maxine Leslie went by Mickey.