Ancelote

Carlotta has a large measure of finger-snapping charm and substance — despite being a not too pleasant character in The Little Mermaid. Carlotta is also the diva/prima donna in The Phantom of the Opera, and there was an Empress Carlotta of Mexico.
 Carlotta (spelled with one 'T' in Spanish), has not been heard much since the 1960s — which might add to its appeal to someone looking for a more international spin on Charlotte.

Carlotta

Old and aristocratic European name that would be tough for an American kid to pull off. 

Clotilda

Camelot

Clotaire

Ellota

Filotea

Lieselotte

Lota

This nickname-name is very popular in Germany, though Lottie is still the preferred version in the US. The problem, of course, is that you'll have to put up with a lotta jokes. See?

Lotta

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 <a href="https://nameberry.com/baby-names/493/german-names-for-girls">German names for girls</a> destined for wider use, though we'd put more money on Lottie.

Lottchen

Louisette

Loyalty is one of the Modern Virtue Names rising precipitously for babies in recent years, used last year for nearly 200 children, about 85 percent of them girls. Loyalty may also owe some of its popularity to trendy sister name Royalty.

Loyalty

Lolotea

Lolotte

Lotara

Lotaria

Lothiriel

Makhelotha

Salote

Sarlote

Foreverthename's list "Charlotte Alternatives" of 21 great name ideas: Ancelote - Sarlote!

Charlotte Alternatives

All of these names can have the nickname "Lottie." Therefore, they are considered Charlotte alternatives.