Surname Grannell (Grannell 
) , globally, is a rare last name. The family name Grannell is habitual in Ireland, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Ireland.
| VARIANT | COUNTRY |
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| Grannell | United Kingdom, Ireland, Canada, Australia, United States |
| william grannell American politician, US (b. 1938) |
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| dave grannell American football tight end, US (b. 1952) |
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| james joseph grannell Ph.D. University College Cork 1977 |
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| andrew grannell researcher |
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| michael john grannell Ph.D. Imperial College London 1970 |
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