Llewellyn is a distinctive boys' name in United States, ranking #9280 in 2011 with 8 recorded births. The name reached its all-time peak in 2025 with 16 births ranking #5749. Since 1996, the popularity has increased by 14.3%. In 2011, approximately 1 in every 237,374 boys born was named Llewellyn. RISING Recent data shows the name is currently rising.