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 | Canada, Isle of Man, United Kingdom, United States, Australia |
|
silsby spalding politician, US (b. 1886) |
|
| william s. silsby American politician and lawyer (1902-1987), US (b. 1902) |
|
|
| paula d. silsby American lawyer, US (b. 1951) |
|
|
| matthew silsby researcher |
|
|
| enoch silsby American cotton broker |
|
|
| anita silsby American taekwondoin, US |
|