Cognomen Dédéyan (Dédéyan 
) , across the world, is an extremely rare family name. The surname Dédéyan is habitual in Western Europe, particularly France, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Dédéyan | France |
| christian dédéyan writer, FR (b. 1910) |
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| charles dédéyan French romanist, FR (b. 1910) |
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marina dédéyan FR (b. 1969) |
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| gérard dédéyan French armenologist and historian, FR (b. 1942) |
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| alexandra dédéyan (b. 1978) |
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