Cognomen Mackay-Prendergast (Mackay-Prendergast 
) , throughout the world, is an extremely rare surname. The family name Mackay-Prendergast is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Mackay, and a last name Prendergast.
| VARIANT | COUNTRY |
|---|---|
| Mackay-Prendergast | United States |