Last name Thilak (Thilak 
) , across the world, is quite a rare surname. The cognomen Thilak is habitual in Sri Lanka, where it is quite a rare surname, Qatar, and United Arab Emirates. Measured by absolute frequency, it is the most numerous in India, Sri Lanka, and United Arab Emirates. More frequently, Thilak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Thilak | Qatar, Saudi Arabia, Sri Lanka, United Arab Emirates, India |
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radhika thilak Indian playback singer, IN (b. 1969) |
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ramesh thilak Indian actor and film producer, IN (b. 1985) |
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| ashwanth thilak actor, IN (b. 1979) |
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| jai thilak researcher |
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| v m m thilak researcher |
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