Cognomen Simpson-Davis (Simpson-Davis 
) , all around the world, is a very rare last name. The last name Simpson-Davis is habitual in Australia, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Parts of the name also exists independently as a last name Simpson, and a last name Davis.
| VARIANT | COUNTRY |
|---|---|
| Simpson-Davis | United Kingdom, United States, Australia |