Kay is a distinctive girls' name in United States, ranking #2249 in 2001 with 72 recorded births. This places Kay in the top 13% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2002 with 79 births ranking #2129. In 2001, approximately 1 in every 25,008 girls born was named Kay. FALLING Recent data shows the name is currently falling.