Cognomen Unsil (Unsil 
) , all over the world, is a rare last name. The cognomen Unsil is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname, Indonesia, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Indonesia, Philippines, and India. Very seldom, Unsil is the forename as well as the last name.