Cognomen Slappendel (Slappendel 
) , throughout the world, is a rare family name. The last name Slappendel is habitual in Netherlands, where it is quite a rare surname, Canada, where it is a very rare surname, and South Africa. Not in comparison with a country's population, it is the most numerous in Netherlands, Canada, and the United States.
| VARIANT | COUNTRY |
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| Slappendel | United Kingdom, South Africa, United States, Canada, Netherlands |
| maarten slappendel Dutch sculptor, NL (b. 1930) |
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iris slappendel Dutch road racing cyclist, NL (b. 1985) |
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| caroline slappendel (1958:?) - Lecturer at Massey University, New Zealand |
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| geerte slappendel researcher |
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| robert slappendel researcher |
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| anneke slappendel NL |
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