Family name Deddens (Deddens 
) , in the world, is a rare cognomen. The cognomen Deddens is characteristic of Netherlands, where it is a rare surname, Germany, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Deddens | Netherlands, Canada, Mexico, United States, Germany |
| pieter deddens Dutch theologian and university professor, NL (b. 1891) |
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| jan deddens Dutch police officer (1917-1999), NL (b. 1917) |
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| karel deddens Dutch theologian and university professor, NL (b. 1924) |
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| theo deddens Frisian author, DE (b. 1934) |
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| james a. deddens researcher |
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| james albert deddens Ph.D. Indiana University 1969 |
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| sabrina deddens German association football player, DE (b. 1986) |
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| rené deddens German speedway rider, DE (b. 1992) |
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