Surname Eiichi (Eiichi 
, 英一 , エイイチ ) , in all the world, is a common last name. The last name Eiichi is characteristic of Eastern Asia, particularly Japan, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Hong Kong, where it is a rare surname. Measured by absolute frequency, it is commonest in Eastern Asia, particularly Japan, China, and Taiwan. Very seldom, Eiichi is the forename as well as the last name.