Cognomen Nielfa (Nielfa 
) , all over the world, is a very rare family name. The surname Nielfa is habitual in Spain, where it is a rare surname, Chile, where it is an extremely rare surname, and Brazil. More frequently, Nielfa is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nielfa | South Africa, Spain, Philippines, Chile, Brazil |
| lorenzo nielfa (b. 1783) |
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gloria nielfa Spanish writer, historian and feminist, ES (b. 1947) |
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| josé antonio nielfa Basque cross-dresser and singer, ES (b. 1947) |
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