Surname Fenby (Fenby 
) , throughout the world, is a rare cognomen. The cognomen Fenby is habitual in Isle of Man, where it is quite a rare surname, Australia, where it is a rare surname, and the United Kingdom. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Australia.
| VARIANT | COUNTRY |
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| Fenby | Australia, Indonesia, Canada, United Kingdom, United States |
| joseph beverley fenby British inventor, GB (b. 1841) |
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| thomas fenby British politician (1875-1956), GB (b. 1875) |
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| eric fenby British composer (1906-1997), GB (b. 1906) |
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| jonathan fenby British newspaper editor, GB (b. 1942) |
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| andy fenby Welsh rugby union footballer, GB (b. 1985) |
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| helen fenby English cricketer, GB (b. 1998) |
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