Keirstyn is a distinctive girls' name in United States, ranking #5524 in 2005 with 23 recorded births. The name reached its all-time peak in 2008 with 27 births ranking #5366. Since 1996, the popularity has increased by 91.7%. In 2005, approximately 1 in every 80,335 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.