Kay is a distinctive girls' name in United States, ranking #2870 in 2014 with 60 recorded births. The name reached its all-time peak in 2002 with 79 births ranking #2129. Since 1996, the popularity has decreased by 10.4%. In 2014, approximately 1 in every 29,766 girls born was named Kay. FALLING Recent data shows the name is currently falling.