Surname Sierat (Sierat 
) , across the world, is a rare cognomen. The surname Sierat is habitual in Netherlands, where it is quite a rare surname, Australia, where it is a rare surname, and Belgium, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Netherlands, Australia, and Germany. Very seldom, Sierat is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sierat | Germany, Belgium, Australia, India, Netherlands |