Likely related to Welsh name forms such as Mair or Merryn, with a soft, sea-associated Celtic feel.
Meryn is a variant spelling of the Welsh name Merin or Meryn, which likely derives from the Old Welsh element mor, meaning "sea" — connecting it to a cluster of Celtic names associated with the ocean and its vast, powerful presence. The Welsh naming tradition has long drawn on the natural landscape, and sea-names carry a particular romance in a culture shaped by the Irish Sea and the Atlantic coast. Meryn may also be understood as a form of the more widely known Mervyn or Mervin, from the Old Welsh Myrddin — the legendary figure behind the name Merlin.
The Merlin connection is among the most storied in the Western literary tradition. Myrddin Wyllt, the "wild" prophet and bard of early Welsh mythology, became the great wizard of Arthurian legend — counselor to Uther Pendragon and Arthur, master of time and prophecy. Geoffrey of Monmouth's twelfth-century Historia Regum Britanniae transformed Myrddin into Merlinus for a Latin-reading European audience, and from that point the name entered the international imagination.
Meryn, as a softer variant, carries this mythological depth while feeling accessible and contemporary. In the twenty-first century, Meryn has found favor as a gender-neutral or specifically feminine spelling variant — the "yn" ending gesturing toward Welsh feminine names (Carwyn, Bronwyn, Cerwyn) while also feeling fresh to English eyes. It appears in fantasy literature and gaming culture as a name for wise, mystical characters, reflecting Merlin's enduring archetype. For parents drawn to Celtic heritage, Arthurian legend, or simply the sea-sound at the name's root, Meryn offers a name that is both rooted in ancient tradition and genuinely uncommon.