Cognomen Siderius (Siderius 
) , in the world, is a rare family name. The family name Siderius is characteristic of Netherlands, where it is quite a rare surname, Canada, where it is a rare surname, and Belgium. In absolute terms, the name is most common in Netherlands, the United States, and Canada. Much less frequently, Siderius is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siderius | Netherlands, India, Canada, United States, Belgium |
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siderius jános Hungarian Reformed pastor, HU (b. 1550) |
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| hermanus siderius NL (b. 1819) |
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jolke siderius Dutch politician, NL (b. 1890) |
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| lolke siderius NL (b. 1885) |
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| gerardus siderius Dutch canoeist, NL (b. 1914) |
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| johannes siderius politician, NL (b. 1922) |
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tjitske siderius Dutch politician, NL (b. 1981) |
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| daniel w siderius researcher |
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| christian siderius researcher |
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| martin siderius researcher |
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