Surname レイセン (Leysen 
, レイセン) , in the entire world, is quite a rare last name. The last name レイセン is habitual in Western Europe, particularly Belgium, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Netherlands, where it is a rare surname. Measured by absolute frequency, it is commonest in Belgium, Netherlands, and the United States. Much less frequently, レイセン is the forename as well as the last name.