Namesakes
Dutch Prime Ministers:
1 prime minister
Æneas Mackay 1888-1891 
Hall-of-Famers:
1 ice hockey
(ice hockey) Mickey MacKay 1952
Notable Actors and Entertainers:
1 actor
Jeff MacKay 1948-2008
Olympic Medalists:
1 bronze
(bronze) Nancy Mackay 1948 4x100 m relay
Rock and Roll Hall-of-Famers:
1 musician
Andy Mackay 2019 Roxy Music