Joslyn is a distinctive girls' name in United States, ranking #714 in 2006 with 399 recorded births. The name reached its all-time peak in 2010 with 461 births ranking #641. Since 1996, the popularity has increased by 105.7%. In 2006, approximately 1 in every 4,765 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.