Cognomen Ricin (Ricin 
, リシン 
) , across the world, is a very rare surname. The family name Ricin is habitual in Japan, where it is a very rare surname, Israel, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Japan, India, and the United States. More prevalently, Ricin is the forename as well as the last name.