Family name Лангін (Longin 
, Лангін 
) , throughout the world, is a common cognomen. The last name Лангін is characteristic of Poland, where it is quite a common surname, Croatia, where it is quite a rare surname, and Austria. In absolute terms, it is commonest in Poland, France, and Croatia. Very seldom, Лангін is the forename as well as the last name.