In the world, セイイチ (Seiichi 
, セイイチ , Seiiti 
) is a rare mostly boy's, but infrequently feminine given name. The forename セイイチ is habitual in Japan, where it is a rare male name, Brazil, where it is a very rare primarily female, but very infrequently masculine name, and France, where it is a very rare boy's name. Not in comparison with a country's population, it is commonest in Japan, China, and Brazil. More frequently, セイイチ is the last name as well as the forename.