Cognomen 白子 (白子 
, Shirako 
) , in the world, is a very rare surname. The cognomen 白子 is characteristic of Netherlands, where it is a very rare surname, Germany, where it is an extremely rare surname, and Canada. Not in comparison with a country's population, this name is the most popular in China, the United States, and Germany. More frequently, 白子 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 白子 | China |
| Shirako | Germany, United States, Netherlands, Japan, China |