Family name Mckirby (Mckirby 
) , globally, is a very rare last name. The cognomen Mckirby is habitual in South Africa, where it is a very rare surname, the United States, where it is an extremely rare surname, and the United Kingdom. Very seldom, Mckirby is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mckirby | United Kingdom, United States, South Africa |