Cognomen 古恩 (古恩 
, Gurn 
) , in the world, is a rare surname. The last name 古恩 is habitual in Ireland, where it is a rare surname, Australia, and Germany. Not in comparison with a country's population, the name is most common in the United States, Germany, and Ireland. Much less frequently, 古恩 is the forename as well as the last name.