Family name Ианцу (Iancu 
, Ианцу 
) , in all the world, is a common last name. The cognomen Ианцу is habitual in Romania, where it is a common surname, Moldova, where it is quite a rare surname, and Israel. In absolute terms, it is commonest in Romania, Italy, and Spain. Much less frequently, Ианцу is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iancu | Romania, Italy, Spain, United States, Afghanistan |
| Ианцу | Russia |