Family name Пеню (Пеню 
, Penyu 
, Penju 
) , in all the world, is quite a rare cognomen. The cognomen Пеню is characteristic of Bulgaria, where it is quite a common surname, Romania, where it is a rare surname, and Indonesia. Also, Пеню is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Пеню | Bulgaria, Ukraine |
| Penyu | Malaysia, Bulgaria, India, South Africa, Indonesia |
| Penju | Canada, United States, India |
| Peniu | Romania, India |