Surname Mernan (Mernan 
) , in all the world, is a rare last name. The last name Mernan is habitual in Nigeria, where it is a rare surname, Venezuela, where it is a very rare surname, and Philippines, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Nigeria, the United States, and Philippines. Likewise, Mernan is the forename as well as the last name.