Surname ストレイン (Strain 
, ストレイン) , in the entire world, is a common cognomen. The cognomen ストレイン is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, and the United States. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Canada. Much less frequently, ストレイン is the forename as well as the last name.