Keirstyn is a distinctive girls' name in United States, ranking #6026 in 1997 with 16 recorded births. The name reached its all-time peak in 2008 with 27 births ranking #5366. Since 1996, the popularity has increased by 33.3%. In 1997, approximately 1 in every 108,791 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.