Worldwide, ثيرو (Thiru 
, Thiero 
, ثيرو) is quite a rare mostly boy's, but uncommonly feminine first name. The first name ثيرو is characteristic of Western Asia, particularly Qatar, where it is quite a rare boy's name, Oman, and United Arab Emirates. Not in comparison with a country's population, this name is the most popular in India, Saudi Arabia, and United Arab Emirates. Likewise, ثيرو is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Thiru | Kenya, United Arab Emirates, India, Sri Lanka, Saudi Arabia |
| Thiero | Morocco, Mali, France, United States, Ivory Coast |