Kay is a distinctive girls' name in United States, ranking #2163 in 2000 with 74 recorded births. The name reached its all-time peak in 2002 with 79 births ranking #2129. Since 1996, the popularity has increased by 10.4%. In 2000, approximately 1 in every 24,540 girls born was named Kay. FALLING Recent data shows the name is currently falling.