Family name Siliakus (Siliakus 
) , around the globe, is a rare cognomen. The family name Siliakus is characteristic of Netherlands, where it is a rare surname, Tanzania, where it is a very rare surname, and Australia. Not in comparison with a country's population, it most frequently occurs in Netherlands, Tanzania, and the United States. Very seldom, Siliakus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Siliakus | Australia, Germany, Tanzania, United States, Netherlands |