Cognomen Yuichiro (Yuichiro 
, ユウイチロウ ) , in the entire world, is a common family name. The surname Yuichiro is characteristic of Japan, where it is quite a common surname, Hong Kong, where it is a rare surname, and Denmark. Measured by absolute frequency, the name is most common in Japan, China, and Indonesia. Very seldom, Yuichiro is the forename as well as the last name.