Cognomen Hartojo (Hartojo 
) , across the world, is quite a rare last name. The last name Hartojo is habitual in Indonesia, where it is a rare surname, Singapore, where it is a very rare surname, and Australia. Not in comparison with a country's population, the name is most common in Indonesia, China, and the United States. Much less frequently, Hartojo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hartojo | China, United States, Germany, Indonesia, Australia |
| hartojo andangdaja Indonesian artist, ID (b. 1930) |
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| sri hartojo ID (b. 1950) |
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| hartojo budi purwanto Indonesian politician (born 1965 in Magetan), ID (b. 1965) |
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