Cognomen Grenell (Grenell 
) , in the entire world, is a rare last name. The family name Grenell is habitual in New Zealand, where it is a rare surname, the United States, where it is a very rare surname, and Australia. Much less frequently, Grenell is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grenell | Australia, Canada, Philippines, New Zealand, United States |
| zelotes grenell (b. 1796) |
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| judson grenell American politician, US (b. 1847) |
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john grenell New Zealand singer, NZ (b. 1944) |
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richard grenell American diplomat, US (b. 1966) |
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| robert gordon grenell American neuroscientist (1916–2004), US (b. 1916) |
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| horace grenell (b. 1909) |
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