Cognomen Silsby (Silsby 
) , all over the world, is a rare last name. The surname Silsby is characteristic of Isle of Man, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and the United States. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Silsby | United Kingdom, Australia, United States, Canada, Isle of Man |
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silsby spalding politician, US (b. 1886) |
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| william s. silsby American politician and lawyer (1902-1987), US (b. 1902) |
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| paula d. silsby American lawyer, US (b. 1951) |
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| matthew silsby researcher |
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| enoch silsby American cotton broker |
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| anita silsby American taekwondoin, US |
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