Family name Silajan (Silajan 
) , all over the world, is a very rare last name. The surname Silajan is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and Philippines. Not in comparison with a country's population, this name is the most popular in Thailand, India, and Malaysia. Very seldom, Silajan is the forename as well as the last name.