Lottchen

This sweet and spunky German nickname for Charlotte has a fun literary connection: Das doppelte Lottchen (English title: Lottie and Lisa) is a children’s book by German author Erich Kästner, which was later adapted into the popular movie The Parent Trap. With the growing popularity of the name Charlotte, Lottchen might be one of the German names for girls destined for wider use, though we'd put more money on Lottie.

Pronounced LOT-chen.