Mckay is a distinctive girls' name in United States, ranking #6591 in 1998 with 15 recorded births. The name reached its all-time peak in 1999 with 21 births ranking #5147. Since 1996, the popularity has increased by 15.4%. In 1998, approximately 1 in every 117,793 girls born was named Mckay. FALLING Recent data shows the name is currently falling.