Llewellyn \ll(e)-well-yn, llewe(l)-lyn\ as a boy's name is pronounced loo-ELL-en. It is of Welsh origin, and the meaning of Llewellyn is "like a lion". Also possibly, like the Welsh name Lleu, derived from the name of an ancient Celtic god, meaning "shining one".

Llewellyn has 6 variant forms: Lew, Lewellen, Lewellyn, Llewellen, Llewelyn and Llwewellin.