Family name Poincy (Poincy 
) , all around the world, is a very rare cognomen. The surname Poincy is characteristic of France, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Poincy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Poincy | United States, France |
| philippe de longvilliers de poincy French colonial governor, FR (b. 1583) |
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| pierre etienne javain de poincy 1737 - 16 Apr 1782 Ouanaminthe, San Domingo (b. 1737) |
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| zepherine sebastienne javain de poincy Nov 1779 Ouanaminthe, San Domingo - 29 Aug 1856 Mansura, Louisiana (b. 1779) |
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paul e. poincy American painter (1833-1909), US (b. 1833) |
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| guillaume javain de poincy - Abt 1763 Fort Dauphin, San Domingo |
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| louis de poincy |
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