Surname Deppen (Deppen 
) , in the entire world, is quite a rare last name. The cognomen Deppen is habitual in France, where it is a rare surname, the United States, and Germany. Much less frequently, Deppen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Deppen | Germany, Switzerland, United States, Argentina, France |
| joannes philibertus deppen Roman Catholic bishop (b. 1808) |
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| franz deppen (b. 1849) |
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| jessie l. deppen (1881-1956) (b. 1881) |
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| stephen a. deppen thoracic surgery researcher |
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| tony deppen American professional wrestler |
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| pauline sargent deppen textile artist |
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| friedrich deppen |
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| karl deppen |
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