Cognomen じゅんこ (Junko 
, じゅんこ) , throughout the world, is quite a rare surname. The cognomen じゅんこ is habitual in Taiwan, where it is a rare surname, Japan, and Poland. In absolute terms, the name is most common in Eastern Asia, particularly Japan, China, and Taiwan. More prevalently, じゅんこ is the forename as well as the last name.