Cognomen Календжиан (Календжиан 
, Kalendzhyan 
, Kalendjian 
) , around the globe, is a very rare family name. The cognomen Календжиан is habitual in Czechia, where it is a rare surname, Russia, where it is a very rare surname, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Russia, Czechia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Календжиан | Russia |
| Kalendzhyan | Czechia, United States, Russia |
| Kalendjian | United States, Canada |