Cognomen Keldu (Keldu 
) , all around the world, is a very rare last name. The cognomen Keldu is characteristic of Estonia, where it is a rare surname, Denmark, and Nigeria, where it is an extremely rare surname. Very seldom, Keldu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Keldu | Nigeria, Denmark, Estonia |
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jógvan við keldu FO (b. 1944) |
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gunvá við keldu FO (b. 1966) |
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| pætur við keldu Danish musician, FO (b. 1970) |
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| tóra við keldu Faroese swimmer and singer, FO (b. 1974) |
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