Mckay is a distinctive girls' name in United States, ranking #14857 in 2008 with 7 recorded births. The name reached its all-time peak in 1999 with 21 births ranking #5147. Since 1996, the popularity has decreased by 46.2%. In 2008, approximately 1 in every 270,103 girls born was named Mckay. FALLING Recent data shows the name is currently falling.