Cognomen Tachdjian (Tachdjian 
) , in the world, is a rare family name. The surname Tachdjian is characteristic of Lebanon, where it is quite a rare surname, Uruguay, and France, where it is a rare surname. Measured by absolute frequency, it is commonest in France, Lebanon, and the United States. Very seldom, Tachdjian is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tachdjian | Lebanon, Argentina, Saudi Arabia, United States, France |
| jean-jacques tachdjian graphic designer, typonoclast, FR (b. 1957) |
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| michel tachdjian French rugby union player, FR (b. 1962) |
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| mathieu tachdjian Armenian rugby union player, AM (b. 1980) |
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| gérard tachdjian researcher |
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Mr, Nice, Eric, Emma, Vane, Vahe, Yael, Zoey, Maria, Marie, Tina, Mario, Maggy, Santi, Silvy, Simon, Serge, Selva, Sonia, Alice, Aline, Manon, Juan, Jean, Josh, Ms, Sam, Ana, Ani, Ara, Avo, Rea, Mary, Matt, Alex, Agop, Azad, Carl, Cole, Beth, Bree, Rosa, Lena, Luis, Jack, Jake, Andre, and Annie