Llewellyn has 21 derivatives that are used in English and other languages. English derivatives include Fluellen, Lewellen, Lewellyn, Lewis, Llewe, Llewelin, Llewellen, Llewelleyn, Llewellin, Llwewellin, Llyweilun, and Llywellynn. Another English derivative is the shortening Lynn (used in Welsh too).
Derivatives of Llewellyn used in other languages include the Welsh Leolin, the Welsh Leoline, the Welsh Llewelyn, the Welsh Llywellyn, and the Welsh Llywelyn. The shortenings Llew (Welsh) and Lyn (Welsh), and the diminutive form Llelo (Welsh) are other foreign variants.
The origin and thus the meaning of the name Llewellyn is inherited by all variant forms.
See also the related form, Lugh (Irish).
Llewellyn is uncommon as a baby name for boys. At the modest height of its usage in 1910, 0.009% of baby boys were given the name Llewellyn. Its ranking then was #722. The baby name has since experienced a decline in popularity, and is of only irregular use now. Within the group of boy names directly linked to Llewellyn, Lewis was the most popular in 2018.
† English pronunciation for Llewellyn: HH as in "he (HH.IY)" ; L as in "lay (L.EY)" ; UW as in "two (T.UW)" ; W as in "we (W.IY)" ; ER as in "hurt (HH.ER.T)" ; IH as in "it (IH.T)" ; N as in "knee (N.IY)"