Cognomen Laidan (Laidan 
) , all over the world, is a rare family name. The surname Laidan is habitual in Philippines, where it is a rare surname, Nicaragua, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Philippines, India, and Nigeria. Much less frequently, Laidan is the forename as well as the last name.