Family name Tilby (Tilby 
) , all around the world, is a rare surname. The surname Tilby is characteristic of New Zealand, where it is a rare surname, the United Kingdom, and Australia. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Australia. Much less frequently, Tilby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tilby | United Kingdom, Australia, Canada, United States, India |
| a. wyatt tilby British journalist (1880-1948) (b. 1880) |
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| angela tilby Anglican priest and theologian (b. 1950) |
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| wendy tilby Canadian film director, CA (b. 1960) |
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| michael j tilby researcher |
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