Mackay is a distinctive boys' name in United States, ranking #6890 in 1999 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 1999, approximately 1 in every 213,343 boys born was named Mackay. FALLING Recent data shows the name is currently falling.