Surname Thiwanka (Thiwanka 
) , across the world, is quite a rare last name. The family name Thiwanka is habitual in Sri Lanka, where it is quite a common surname, and United Arab Emirates, where it is a rare surname. Also, Thiwanka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thiwanka | Qatar, United Arab Emirates, Sri Lanka, Australia, Kuwait |
| ushan thiwanka Sri Lankan high jumper (b. 1998) |
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