Cognomen Knyff (Knyff 
) , in all the world, is a very rare family name. The surname Knyff is characteristic of Netherlands, where it is a rare surname, New Zealand, where it is a very rare surname, and Canada. Measured by absolute frequency, the name is most common in Netherlands, the United States, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Knyff | Netherlands, Canada, France, New Zealand, United States |
| hothje fan knyff NL (b. 1628) |
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| horatius hiddema van knyff politician, NL (b. 1703) |
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| jean françois de knyff 26 Jul 1711 Anvers - 17 Jul 1775 Anvers (b. 1711) |
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| jacques antoine édouard knyff French soldier, FR (b. 1787) |
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rené de knyff French racing driver (1865-1955), FR (b. 1865) |
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| alfred de knyff Belgian painter (1819-1885), BE (b. 1819) |
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| gaétan de knyff BE (b. 1871) |
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