Kay is a distinctive girls' name in United States, ranking #2129 in 2002 with 79 recorded births. The name reached its all-time peak in 2002 with 79 births ranking #2129. Since 1996, the popularity has increased by 17.9%. In 2002, approximately 1 in every 22,745 girls born was named Kay. FALLING Recent data shows the name is currently falling.