Across the world, Thilak (Thilak 
) is quite a rare primarily masculine, but very infrequently feminine first name. The first name Thilak is characteristic of Sri Lanka, where it is quite a rare boy's name, Qatar, and Kuwait, where it is quite a rare mostly male, but seldom girly name. In absolute terms, it is the most numerous in Sri Lanka, India, and Saudi Arabia. Very seldom, Thilak is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Thilak | Qatar, Saudi Arabia, Sri Lanka, United Arab Emirates, India |
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thilak senasinghe Sri Lankan writer, LK (b. 1958) |
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| kalthoon thilak Indian actor (1943-2021), IN (b. 1943) |
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| thilak kumara rathnayake Sri Lankan actor and announcer (b. 1960) |
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| thilak fernando Sri Lankan cricketer, LK (b. 1967) |
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| thilak rajapaksha Sri Lankan politician, LK (b. 1971) |
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| thilak naidu cricketer, IN (b. 1978) |
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| thilak k mudalige researcher |
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| thilak samuel jepegnanam researcher (ORCID 0000-0003-1842-5907) |
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| thilak b shetty researcher |
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| thilak weerarathna researcher |
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| thilak gunasekera Ph.D. Wayne State University 1997 |
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| thilak dammalage |
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| thilak reddy enugala researcher |
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