Fionn is a distinctive boys' name in England & Wales, ranking #790 in 2015 with 40 recorded births. This places Fionn in the top 13% of ranked UK boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2022 with 69 births ranking #555. Since 1996, the popularity has increased by 207.7%. In 2015, approximately 1 in every 8,331 boys born was named Fionn. STABLE Recent data shows the name is currently stable.