Last name Silby (Silby 
) , globally, is a rare family name. The family name Silby is habitual in New Zealand, where it is quite a rare surname, Australia, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in Australia, the United States, and the United Kingdom. Also, Silby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Silby | India, New Zealand, United States, Australia, United Kingdom |
| reginald miles silby GB (b. 1884) |
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| joan beryl marion elizabeth silby Peerage person ID=274869 |
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| wayne silby American social investor & entrepreneur |
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| mark w silby researcher (ORCID 0000-0002-3092-8008) |
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| granville alexander silby Peerage person ID=274868 |
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