Oisin is a distinctive boys' name in United States, ranking #6791 in 2001 with 10 recorded births. This places Oisin in the bottom 45% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2020 with 31 births ranking #3546. In 2001, approximately 1 in every 194,283 boys born was named Oisin. FALLING Recent data shows the name is currently falling.