Cognomen Галлагхер (Галлагхер 
) , in the entire world, is a very rare last name. The last name Галлагхер is habitual in Eastern Europe, particularly Russia, where it is an extremely rare surname, and Ukraine.
| VARIANT | COUNTRY |
|---|---|
| Галлагхер | Russia, Ukraine |
Gallagcher, Gallagher, and Hallagher