Keirstyn is a distinctive girls' name in United States, ranking #7718 in 2010 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 2010, approximately 1 in every 111,083 girls born was named Keirstyn. FALLING Recent data shows the name is currently falling.