Cognomen Sidoy (Sidoy 
) , in the entire world, is a rare family name. The cognomen Sidoy is habitual in Philippines, where it is a rare surname, Israel, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Very seldom, Sidoy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sidoy | Philippines, Israel, United States, India, Peru |