Cognomen Gilbirt (Gilbirt 
) , globally, is a very rare family name. The cognomen Gilbirt is habitual in Israel, where it is a very rare surname, Nigeria, where it is an extremely rare surname, and Philippines. In absolute terms, the name is most common in Nigeria, India, and Israel. More frequently, Gilbirt is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gilbirt | Nigeria, Israel, India, Philippines, United States |