Cognomen Juan Demetrio (Juan Demetrio 
) , all around the world, is a very rare family name. The surname Juan Demetrio is habitual in Chile, where it is a rare surname, and Spain, where it is a very rare surname. More prevalently, Juan Demetrio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Juan Demetrio | Spain, Mexico, Chile, Ecuador, Peru |
Paz, Mellico, Mendoza, Sanchez, Salazar, Acevedo, Cordova, Cuellar, Tiznado, Herrera, Zuñiga, Murrieta, Carrasco, Castillo, Briceño, Gonzalez, Gonzales, Trujillo, Espiritu, Vidaurre, Viamonte, Sepulveda, Quispe, Osorio, Flores, Vargas, Mota, Soto, Cruz, Ruiz, Diaz, Leon, Luna, Vela, Ayala, Peña, Dominguez, Ramos, Reyes, Lopez, Muñoz, Chavez, Castro, Conejo, Correa, Garcia, Tuesta, Huaman, Rojas, and Gutierrez