Surname 为仁 (为仁 
, Weiren 
) , throughout the world, is a rare last name. The cognomen 为仁 is habitual in Cayman Islands, where it is quite a rare surname, Singapore, where it is a rare surname, and China, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in China, Singapore, and Malaysia. More prevalently, 为仁 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 为仁 | China |
| Weiren | Taiwan, China, Singapore, Malaysia, United States |