Cognomen Kertowidjojo (Kertowidjojo 
) , in all the world, is a rare surname. The family name Kertowidjojo is characteristic of Singapore, where it is a rare surname, Indonesia, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kertowidjojo | Singapore, Indonesia, United States |