Cognomen コ (Ko 
, Gu 
, コ ) , throughout the world, is a prevalent surname. The family name コ is characteristic of Myanmar, where it is a prevalent surname, Cayman Islands, where it is a common surname, and Hong Kong (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Myanmar, China, and India. Also, コ is the forename as well as the last name.