Kay is a distinctive girls' name in United States, ranking #3643 in 2021 with 42 recorded births. The name reached its all-time peak in 2002 with 79 births ranking #2129. Since 1996, the popularity has decreased by 37.3%. In 2021, approximately 1 in every 39,041 girls born was named Kay. FALLING Recent data shows the name is currently falling.