Cognomen Downum (Downum 
) , all around the world, is a rare family name. The cognomen Downum is characteristic of the United States, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Downum | New Zealand, United States, Canada |
| amanda downum American writer, US (b. 1979) |
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| philip downum Ph.D. Syracuse University 1970 |
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| bob downum college basketball player (1957–1958) Pacific |
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