Keirstyn is a distinctive girls' name in United States, ranking #6426 in 2009 with 21 recorded births. The name reached its all-time peak in 2008 with 27 births ranking #5366. Since 1996, the popularity has increased by 75.0%. In 2009, approximately 1 in every 87,470 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.