Llewellyn is a Welsh male given name, derived from the personal name Llywelyn, which means "leader" or "chief". It is composed of the elements 'llyw', meaning leader, and 'elwyn', meaning noble friend. The name Llewellyn was borne by several medieval Welsh princes, most notably Llewellyn ap Gruffudd (also known as Llywelyn Fawr), who ruled over Wales in the late 12th century and early 13th century. This historical figure played a significant role in Welsh history due to his defiance against English rule during that period. Today, Llewellyn remains a lesser-used name, but it is still seen occasionally, particularly within Welsh-speaking communities. It can be spelled in various ways, including Llywelyn, Llewelyn, and Llewellin, reflecting its Welsh origin.
"Llewellyn saw its peak popularity between 1922 and 1926, with 16 to 17 births per year during this period. However, it remains relatively uncommon overall, with only 324 recorded births in total over the specified years."