Family name Mc Cullough (Mc Cullough 
) , all over the world, is quite a rare surname. The last name Mc Cullough is habitual in Ireland, where it is a rare surname, the United States, and Canada. In absolute terms, it is the most numerous in the United States, Canada, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Mc Cullough | Australia, Canada, Ireland, United Kingdom, United States |