Cognomen Adelfo (Adelfo 
) , all over the world, is quite a common surname. The cognomen Adelfo is characteristic of Latin America and the Caribbean, particularly Mexico, where it is quite a rare surname, Venezuela, where it is a rare surname, and Honduras. Not in comparison with a country's population, this name is the most popular in Mexico, Venezuela, and Spain. Also, Adelfo is the forename as well as the last name.