Surname มรสุม (Monso 
, Monsom 
, Monsoi ) , across the world, is a rare last name. The family name มรสุม is habitual in Cameroon, where it is a rare surname, Norway, and Estonia. Measured by absolute frequency, it is commonest in Spain, Cameroon, and France. Also, มรสุม is the forename as well as the last name.