Mackay is a distinctive boys' name in United States, ranking #7942 in 2004 with 9 recorded births. The name reached its all-time peak in 2012 with 13 births ranking #6525. Since 1996, the popularity has increased by 12.5%. In 2004, approximately 1 in every 220,534 boys born was named Mackay. FALLING Recent data shows the name is currently falling.