Cognomen Fernau (Fernau 
, 费诺) , all over the world, is quite a rare last name. The surname Fernau is habitual in Bosnia and Herzegovina, where it is quite a rare surname, Slovenia, and Germany, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Bosnia and Herzegovina.
| VARIANT | COUNTRY |
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| Fernau | Bosnia and Herzegovina, Poland, United States, Slovenia, Germany |
| louis fernau DE (b. 1814) |
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| matthias fernau DE (b. 1822) |
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| curt fernau DE (b. 1851) |
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| albert fernau (b. 1869) |
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| hermann fernau German lawyer, writer, journalist and pacifist, DE (b. 1884) |
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| rudolf fernau actor, DE (b. 1898) |
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| joachim fernau German journalist, author and painter (1909-1988), DE (b. 1909) |
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| friedrich-wilhelm fernau DE (b. 1913) |
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| john christopher fernau (born 1927), GB (b. 1927) |
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| francis george guy fernau (born 1929) (b. 1929) |
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| gabriele fernau (b. 1922) |
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| michael fernau German jurist, DE (b. 1955) |
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pia fernau DE |
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| henning fernau (b. 1965) |
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| francis ford fernau (died 1968) |
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