Llewellyn is a distinctive boys' name in United States, ranking #5749 in 2025 with 16 recorded births. The name reached its all-time peak in 2025 with 16 births ranking #5749. Since 1996, the popularity has increased by 128.6%. In 2025, approximately 1 in every 106,755 boys born was named Llewellyn. RISING Recent data shows the name is currently rising.