Family name 一川 (一川 
, Issen 
, Иссэн 
) , across the world, is quite a rare last name. The surname 一川 is characteristic of Mauritius, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Singapore. In absolute terms, the name is most common in China, the United States, and Hong Kong. More frequently, 一川 is the forename as well as the last name.