Family name Ostby (Ostby 
) , around the world, is quite a rare cognomen. The last name Ostby is habitual in Norway, where it is quite a rare surname, the United States, where it is a rare surname, and Sweden. In absolute terms, the name is most common in the United States, Norway, and Canada. Much less frequently, Ostby is the forename as well as the last name.
| byron c. ostby Member of the Wisconsin State Assembly (1924-2003), US (b. 1924) |
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| eben fiske ostby American animator, US (b. 1955) |
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| pamela l ostby researcher |
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| erin t ostby researcher (ORCID 0000-0002-2318-1911) |
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