Llewellyn is a distinctive Welsh name meaning "leader's descendant," derived from the elements "llw" (leader or hero) and "elwyn" (from the personal name Elwen). It has been carried by influential historical figures like Llewelyn ap Gruffudd, also known as Llewelyn the Last. Today, Llewellyn is a strong, powerful choice for both boys and girls, reflecting its rich Welsh heritage.