* Charlotte: This is the most common feminine form of Charles, and it's a classic and elegant name.
* Charlene: This is another popular feminine form, though it's less common than Charlotte.
* Chloë: While not directly related to Charles, Chloe is a similar-sounding name with a feminine feel.
* Carola: This is a less common but still valid option, particularly in German-speaking countries.
* Charis: This is a Greek name meaning "grace" and can be considered a feminine form of Charles.
Ultimately, the choice of a feminine form for Charles depends on personal preference.