Llewellyn is a distinctive boys' name in United States, ranking #7389 in 2010 with 11 recorded births. The name reached its all-time peak in 2025 with 16 births ranking #5749. Since 1996, the popularity has increased by 57.1%. In 2010, approximately 1 in every 174,401 boys born was named Llewellyn. RISING Recent data shows the name is currently rising.