Keirstyn is a distinctive girls' name in United States, ranking #5366 in 2008 with 27 recorded births. The name reached its all-time peak in 2008 with 27 births ranking #5366. Since 1996, the popularity has increased by 125.0%. In 2008, approximately 1 in every 70,027 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.