Surname Tiercy (Tiercy 
) , all around the world, is a very rare family name. The cognomen Tiercy is habitual in Switzerland, where it is a rare surname, France, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Tiercy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tiercy | Switzerland, France, Brazil, United States |
| georges-césar tiercy Swiss astronomer (1886-1955), CH (b. 1886) |
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| luc tiercy CH (b. 1959) |
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| jean-marie tiercy researcher |
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