Family name Thusyanthan (Thusyanthan 
) , globally, is a rare last name. The surname Thusyanthan is habitual in Sri Lanka, where it is quite a rare surname, the United Kingdom, where it is a very rare surname, and Canada, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Sri Lanka, the United Kingdom, and France. Likewise, Thusyanthan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thusyanthan | Canada, United Kingdom, Sri Lanka, Qatar, Indonesia |