Surname 繁男 (Shigeo 
, 繁男 ) , in the world, is quite a common cognomen. The cognomen 繁男 is habitual in Japan, where it is quite a rare surname, Malaysia, where it is a rare surname, and Hungary. Not in comparison with a country's population, it most frequently occurs in Japan, China, and Myanmar. Much less frequently, 繁男 is the forename as well as the last name.