Kierstynn is a distinctive girls' name in United States, ranking #12173 in 2007 with 9 recorded births. The name reached its all-time peak in 2007 with 9 births ranking #12173. Since 1996, the popularity has increased by 12.5%. In 2007, approximately 1 in every 213,605 girls born was named Kierstynn. FALLING Recent data shows the name is currently falling.