Surname 入口 (入口 
, Irikuchi 
, Iriguchi 
) , all over the world, is a rare cognomen. The family name 入口 is characteristic of Brazil, where it is a very rare surname, Canada, where it is an extremely rare surname, and the United States. Measured by absolute frequency, this name is the most popular in Brazil, the United States, and China. Very seldom, 入口 is the forename as well as the last name.