Globally, Thillai (Thillai 
) is a rare unisex first name. The forename Thillai is characteristic of Kuwait, where it is a rare male name, Singapore, and Saudi Arabia. In absolute terms, the name is most common in India, Saudi Arabia, and Kuwait. Also, Thillai is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Thillai | Saudi Arabia, United Arab Emirates, Sri Lanka, Malaysia, India |
| thillai sivakumar natarajan researcher |
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| thillai govindaraja researcher (ORCID 0000-0002-7671-6676) |
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