Last name Grannis (Grannis 
) , across the world, is a rare surname. The last name Grannis is habitual in the United States, where it is a rare surname, Greece, where it is a very rare surname, and Canada.
| sidney smith grannis American politician – Minnesota -- "S.S." House 1864 (District 9), US (b. 1820) |
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| leroy grannis American surfer and photographer, US (b. 1917) |
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| susanna grannis American academic (b. 1937) |
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| paul grannis American physicist, US (b. 1938) |
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| pete grannis American politician, US (b. 1940) |
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| john grannis Canadian politician, CA |
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| shaun j. grannis professor of medical informatics |
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| john grannis college basketball player (1962–1963) New Mexico |
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