Cognomen Khalil-Ullah (Khalil-Ullah 
) , globally, is an extremely rare family name. The family name Khalil-Ullah is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Much less frequently, Khalil-Ullah is the forename as well as the last name. Parts of the name also exists independently as a first name Khalil, and a last name Ullah.
| VARIANT | COUNTRY |
|---|---|
| Khalil-Ullah | United Kingdom, United States |