Family name Didmus (Didmus 
) , in all the world, is an extremely rare cognomen. The cognomen Didmus is habitual in Sub-Saharan Africa, particularly Nigeria, where it is an extremely rare surname. Much more prevalently, Didmus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Didmus | United States, Zimbabwe, Nigeria, Tanzania |