Family name Thiyaku (Thiyaku 
) , in the world, is an extremely rare cognomen. The cognomen Thiyaku is characteristic of Malaysia, where it is an extremely rare surname, and India. More prevalently, Thiyaku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thiyaku | Malaysia, India |
Raaj, Rajan, Marutha, Kumaran, Muniandy, Gurusamy, Sivaloganthan, Subramaniam, and Sivaloganathan