Cognomen 茂久 (Kuriyama 
, 茂久 ) , all around the world, is quite a rare family name. The surname 茂久 is habitual in Japan, where it is a rare surname, Brazil, and Singapore. Measured by absolute frequency, it is the most numerous in Brazil, Japan, and the United States. Very seldom, 茂久 is the forename as well as the last name.