Last name Gronum (Gronum 
) , throughout the world, is a very rare surname. The last name Gronum is habitual in Sub-Saharan Africa, particularly South Africa, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Gronum | South Africa |
| m.a. gronum South African writer, ZA (b. 1895) |
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| c.f. gronum ZA (b. 1893) |
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| anthonie gronum South African rugby union footballer, ZA (b. 1985) |
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