Cognomen Renki (Renki 
, 廉生 
, Dreng 
) , across the world, is a rare last name. The cognomen Renki is habitual in Norway, where it is quite a rare surname, Japan, where it is a rare surname, and Denmark. In absolute terms, it is the most numerous in Japan, China, and Norway. Likewise, Renki is the forename as well as the last name.