Joslyn is a distinctive girls' name in United States, ranking #1027 in 2001 with 210 recorded births. This places Joslyn in the top 6% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2010 with 461 births ranking #641. In 2001, approximately 1 in every 8,574 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.