Throughout the world, Maria Adela (Maria Adela 
) is quite a common principally feminine, but very infrequently male forename. The forename Maria Adela is habitual in Guam, where it is quite a common female name, Chile, where it is quite a rare female name, and Paraguay. Measured by absolute frequency, it is commonest in Spain, Chile, and Peru. Very seldom, Maria Adela is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Maria Adela | Peru, Paraguay, Spain, Chile, Ecuador |
Soto, Quispe, Morales, Mendoza, Sanchez, Salazar, Alvarez, Balanza, Paramio, Ramirez, Jimenez, Vasquez, Martinez, Sandoval, Alvarado, Castillo, Gallardo, Gonzalez, Gonzales, Espinoza, Rodriguez, Gutierrez, Fortes, Vargas, Torres, Galvez, Sosa, Ruiz, Diaz, Noda, Vega, Salas, Silva, Arias, Arcos, Perez, Hernandez, Ramos, Reyes, Gomez, Lopez, Luque, Martin, Medina, Muñoz, Castro, Blanco, Garcia, Rojas, and Fernandez