Merwin is a distinctive boys' name in United States, ranking #13914 in 2008 with 5 recorded births. This places Merwin in the bottom 5% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2008 with 5 births ranking #13914. In 2008, approximately 1 in every 407,989 boys born was named Merwin. STABLE Recent data shows the name is currently stable.