Globally, セイシロウ (セイシロウ ) is an extremely rare unknown gender first name. Much more frequently, セイシロウ is the last name as well as the forename.
Seishirou
サトウ, コボリ, and ナカムラ
) is an extremely rare unknown gender first name. Much more frequently, セイシロウ is the last name as well as the forename.