Last name Sienen (Sienen 
) , all over the world, is an extremely rare family name. Much more prevalently, Sienen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sienen | Philippines, India |
|
jakob albrecht von sienen DE (b. 1768) |
|
| jakob albrecht von sienen DE (b. 1724) |
|