Cognomen تسو (Tsu 
, Zuo 
, Tso 
) , in all the world, is a widespread family name. The cognomen تسو is characteristic of Cayman Islands, where it is a common surname, Hong Kong, where it is quite a common surname, and Bermuda (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in China, Hong Kong, and the United States. Much less frequently, تسو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tsu | Japan, China, Indonesia, Hong Kong, United States |
| Zuo | Japan, China, Hong Kong, Taiwan, United States |
| Tso | China, Indonesia, Hong Kong, United States, Democratic Republic of the Congo |
| تسو | Sudan, Iran |