Last name Calagiu (Calagiu 
) , across the world, is a rare surname. The cognomen Calagiu is habitual in Romania, where it is quite a rare surname, Canada, where it is an extremely rare surname, and Philippines. Not in comparison with a country's population, this name is the most popular in Romania, the United States, and Canada. Much less frequently, Calagiu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Calagiu | Canada, Romania, United States, Philippines |