Family name Onsaga (Onsaga 
) , around the globe, is a very rare last name. The surname Onsaga is habitual in Philippines, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Onsaga is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onsaga | United States, Philippines |