Family name Harnum (Harnum 
) , across the world, is quite a rare surname. The last name Harnum is habitual in Canada, where it is a rare surname, Indonesia, and New Zealand. Not in comparison with a country's population, the name is most common in Indonesia, Canada, and the United States. Also, Harnum is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Harnum | Canada, New Zealand, United States, Indonesia, China |
| dave harnum college basketball player (1964–1964) Maine |
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| debbie harnum researcher |
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| don harnum college basketball player (1962–1962) Maine |
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| mike harnum college basketball player (1985–1988) Princeton |
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| don harnum American basketball coach and college athletics administrator |
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