Mckay is a distinctive girls' name in United States, ranking #5147 in 1999 with 21 recorded births. The name reached its all-time peak in 1999 with 21 births ranking #5147. Since 1996, the popularity has increased by 61.5%. In 1999, approximately 1 in every 84,466 girls born was named Mckay. FALLING Recent data shows the name is currently falling.