Last name Ионеску (Ionescu 
, Ionesku 
, Ионеску 
) , in all the world, is a common surname. The family name Ионеску is characteristic of Romania, where it is a common surname, Moldova, where it is quite a common surname, and Maldives, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Romania, Italy, and the United States. Much less frequently, Ионеску is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ionescu | Romania, Germany, Spain, Italy, United States |
| Ionesku | United Kingdom, Ukraine, Spain, Bulgaria |
| Ионеску | Russia |
| Yonesku | Bulgaria |