Gwyn is a distinctive girls' name in United States, ranking #11372 in 2001 with 8 recorded births. This places Gwyn in the bottom 37% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2006 with 20 births ranking #6439. In 2001, approximately 1 in every 225,070 girls born was named Gwyn. FALLING Recent data shows the name is currently falling.