Cognomen Filby (Filby 
, فيلبي) , across the world, is quite a rare last name. The cognomen Filby is habitual in the United Kingdom, where it is quite a rare surname, Australia, and Canada, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, the United States, and Australia. Much less frequently, Filby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Filby | Australia, United Kingdom, United States, South Africa, Canada |
| william filby English Roman Catholic priest and martyr (b. 1555) |
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| david filby German politician, DE (b. 1810) |
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| william charles mary filby British composer (b. 1836) |
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| p. william filby Percy W Filby; b. Dec. 10, 1911; d. Nov 2, 2002; SSN Issued Maryland, US (b. 1911) |
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| eric filby English table tennis and lawn tennis player (b. 1917) |
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| bill filby (b. 1911) |
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| e.j. filby (b. 1917) |
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| william filby British archdeacon (b. 1933) |
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| ian filby English footballer (born 1954), GB (b. 1954) |
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| ian filby Chairman, Joules Group plc, since 2018 (b. 1959) |
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| andrew filby researcher |
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| alex filby researcher |
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| benjamin w filby researcher (ORCID 0000-0002-0416-7903) |
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| niel filby |
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| paul filby |
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