Joslyn is a distinctive girls' name in United States, ranking #1067 in 1997 with 178 recorded births. This places Joslyn in the top 7% 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 1997, approximately 1 in every 9,779 girls born was named Joslyn. FALLING Recent data shows the name is currently falling.