Surname Opdam (Opdam 
) , in the world, is quite a rare cognomen. The family name Opdam is habitual in Netherlands, where it is quite a rare surname, Norway, where it is a rare surname, and Australia. In absolute terms, it is commonest in Netherlands, Australia, and Canada.
| VARIANT | COUNTRY |
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| Opdam | Australia, Germany, Canada, Norway, Netherlands |
| c.a. opdam NL (b. 1883) |
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eric m. opdam Dutch mathematician (b. 1960) |
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| john opdam Dutch murderer, NL (b. 1916) |
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barry opdam Dutch footballer, NL (b. 1976) |
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| niek j m opdam researcher |
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| joeri opdam researcher |
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| kim opdam researcher |
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| mark opdam researcher |
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| nic opdam |
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| paul f. m. opdam |
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| levi opdam Dutch footballer, NL (b. 1996) |
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