Cognomen Diemma (Diemma 
) , worldwide, is a very rare last name. The last name Diemma is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Much more prevalently, Diemma is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Diemma | United States, Senegal, Philippines |