Across the world, セイゴ (Seigo 
, セイゴ ) is a rare principally boy's, but very infrequently girly forename. The first name セイゴ is characteristic of Japan, where it is a rare boy's name, the United States, where it is an extremely rare principally male, but very seldom girly name, and China, where it is an extremely rare male name. More frequently, セイゴ is the last name as well as the forename.