Cognomen レンコ (Renko 
, レンコ ) , across the world, is quite a rare family name. The cognomen レンコ is habitual in Slovenia, where it is quite a common surname, Finland, where it is quite a rare surname, and Croatia. In absolute terms, this name is the most popular in Japan, the United States, and Finland. Very seldom, レンコ is the forename as well as the last name.