Cognomen Runzi (润滋 
, Runzi 
) , around the globe, is a rare surname. The last name Runzi is habitual in Switzerland, where it is a rare surname, Malaysia, where it is a very rare surname, and China. Not in comparison with a country's population, it most frequently occurs in China, Switzerland, and the United States. More prevalently, Runzi is the forename as well as the last name.