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Globally, Casilda (Casilda
) is a common feminine first name. The given name Casilda is habitual in Equatorial Guinea, where it is quite a common girly name, Antigua and Barbuda, where it is quite a common masculine name, and Bolivia, where it is quite a rare female name. Measured by absolute frequency, the name is most common in Latin America and the Caribbean, particularly Mexico, Peru, and Argentina. Also, Casilda is the last name as well as the forename.
Casilda is also a name for the fictitious and mythical characters: Casilda , the operatic character in the operetta The Gondoliers.