Around the world, Juan Casimiro (Juan Casimiro 
) is a very rare male given name. The forename Juan Casimiro is habitual in Chile, where it is a rare masculine name, Peru, where it is a very rare masculine name, and Spain, where it is a very rare mostly male, but seldom girly name. Very seldom, Juan Casimiro is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Juan Casimiro | Peru, Argentina, Spain, Chile, Ecuador |
Vega, Rojas, Tarifa, Sanchez Calva, and Carmona Barrera