Llewelyn is a distinctive boys' name in England & Wales, ranking #1705 in 2025 with 15 recorded births. This places Llewelyn in the top 28% of ranked UK boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 24 births ranking #1146. Since 1996, the popularity has increased by 50.0%. In 2025, approximately 1 in every 18,129 boys born was named Llewelyn. STABLE Recent data shows the name is currently stable.