Keirstan is a distinctive girls' name in United States, ranking #9533 in 2000 with 10 recorded births. The name reached its all-time peak in 1996 with 12 births ranking #7357. Since 1996, the popularity has decreased by 16.7%. In 2000, approximately 1 in every 181,597 girls born was named Keirstan. FALLING Recent data shows the name is currently falling.