Kay is a distinctive girls' name in United States, ranking #3836 in 2009 with 41 recorded births. The name reached its all-time peak in 2002 with 79 births ranking #2129. Since 1996, the popularity has decreased by 38.8%. In 2009, approximately 1 in every 44,802 girls born was named Kay. FALLING Recent data shows the name is currently falling.