Keirstyn is a distinctive girls' name in United States, ranking #12511 in 2014 with 8 recorded births. The name reached its all-time peak in 2008 with 27 births ranking #5366. Since 1996, the popularity has decreased by 33.3%. In 2014, approximately 1 in every 223,242 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.