Surname 根西 (根西 
, Guernsey 
) , all over the world, is quite a rare last name. The last name 根西 is habitual in Guernsey, where it is a common surname, the United States, where it is a rare surname, and Israel. In absolute terms, it is the most numerous in the United States, Canada, and Guernsey. Very seldom, 根西 is the forename as well as the last name.