Surname Olby (Olby 
) , all around the world, is a rare cognomen. The cognomen Olby is characteristic of Sweden, where it is a rare surname, the United Kingdom, and Switzerland, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Sweden, the United Kingdom, and the United States. Very seldom, Olby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olby | Sweden, Switzerland, United States, United Kingdom, South Africa |
| olga olby French painter (1900-1990), FR (b. 1900) |
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| robert olby British historian, GB (b. 1933) |
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| pia olby (b. 1956) |
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| douglas eric olby Peerage person ID=617325 |
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| natasha j olby researcher |
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| angela beryl olby Peerage person ID=617326 |
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