Last name ثيرو (Thiru 
, Thiero 
, ثيرو) , worldwide, is quite a common surname. The cognomen ثيرو is habitual in Mali, where it is quite a rare surname, Qatar, and Sri Lanka. In absolute terms, the name is most common in Mali, India, and Sri Lanka. Also, ثيرو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thiru | Kenya, Saudi Arabia, India, Sri Lanka, United Arab Emirates |
| Thiero | Ivory Coast, United States, France, Mali, Morocco |