Family name Monstrum (Monster 
, Monstre 
, Monstrum) , all around the world, is quite a rare surname. The surname Monstrum is habitual in Netherlands, where it is quite a rare surname, Mongolia, and Cyprus. Not in comparison with a country's population, it is the most numerous in Netherlands, Indonesia, and China. Likewise, Monstrum is the forename as well as the last name.