Surname Derkaloustian (Derkaloustian 
) , across the world, is a very rare cognomen. The cognomen Derkaloustian is habitual in Lebanon, where it is a rare surname, France, 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 Lebanon, France, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Derkaloustian | Lebanon, United States, Canada, France, Brazil |