Last name 伯延 (Boyen 
, 伯延 
) , all over the world, is quite a rare surname. The cognomen 伯延 is characteristic of Belgium, where it is quite a rare surname, Romania, where it is a rare surname, and Germany. Not in comparison with a country's population, it is the most numerous in Belgium, Germany, and Brazil. Very seldom, 伯延 is the forename as well as the last name.