Cognomen 根 (根 
, Gwyn 
) , across the world, is a common surname. The last name 根 is habitual in China, where it is quite a rare surname, the United States, where it is a rare surname, and New Zealand. Measured by absolute frequency, the name is most common in China, the United States, and the United Kingdom. More frequently, 根 is the forename as well as the last name.