Family name Costian (Costian 
) , worldwide, is a very rare last name. The surname Costian is habitual in Romania, where it is a rare surname, Philippines, where it is a very rare surname, and Germany, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Romania, Philippines, and the United States. Very seldom, Costian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Costian | Germany, Romania, Philippines, United States, Netherlands |
| daniela costian Romanian-born Australian discus thrower, RO (b. 1965) |
|