Last name Lunatic (Luna 
, Lunatic 
, Lunatico 
) , all over the world, is a widespread surname. The cognomen Lunatic is characteristic of Latin America and the Caribbean, particularly Mexico, where it is a common surname, Argentina, and Nicaragua (explore the name in all countries). Not in comparison with a country's population, the name is most common in Mexico, Argentina, and the United States. Much less frequently, Lunatic is the forename as well as the last name.