Surname Demmy (Demmy 
) , in the world, is quite a rare cognomen. The surname Demmy is characteristic of Nigeria, where it is quite a rare surname, the United States, where it is a very rare surname, and Venezuela. Not in comparison with a country's population, this name is the most popular in Nigeria, the United States, and Indonesia. Also, Demmy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demmy | Philippines, Nigeria, United States, Indonesia, Uganda |
| john demmy American football player (1904-1970), US (b. 1904) |
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| lawrence demmy British ice dancer, GB (b. 1930) |
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| todd l demmy researcher |
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