Joslyn is a distinctive girls' name in United States, ranking #711 in 2008 with 420 recorded births. The name reached its all-time peak in 2010 with 461 births ranking #641. Since 1996, the popularity has increased by 116.5%. In 2008, approximately 1 in every 4,502 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.