Keirstyn is a distinctive girls' name in United States, ranking #10788 in 2011 with 10 recorded births. The name reached its all-time peak in 2008 with 27 births ranking #5366. Since 1996, the popularity has decreased by 16.7%. In 2011, approximately 1 in every 175,880 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.