Merlyn is a variant of Merlin, sometimes used as a feminine form. The name has been influenced by the Welsh word merlyn meaning "pony." Etymology and Origin The name Merlyn derives from Merlin, which is a Latinized form of the Welsh name Myrddin. The 12th-century chronicler Geoffrey of Monmouth chose the form Merlinus over Merdinus to avoid association with the French word merde ("excrement"). Geoffrey's Merlin is a composite character based on the legendary Welsh prophet Myrddin Wyllt and the historical 5th-century Romano-British military leader Ambrosius Aurelianus (also known as Emrys Wledig). In Arthurian legend, Merlin serves as a magician and counselor to King Arthur. Notable Bearers Merly Cultural Significance Merlyn, while less common than Merlin, appears in literature and media, sometimes as a female name. Key Facts Meaning: Possibly "pony" (Welsh); often associated with Merlin the magician Origin: English variant of Merlin, ultimately from Welsh Myrddin Type: First name, unisex but often feminine Usage Regions: English-speaking countries