Welsh name possibly meaning 'around the valley' or from the place name Newcastle Emlyn in Wales.
Emlyn is a Welsh given name with roots in the Latinized form *Aemilianus*, connected to the Roman *Aemilius* family — a gens whose name may derive from the Latin *aemulus*, meaning "rival" or "eager to emulate." The name was transmitted into Welsh through early medieval contact with Roman Britain and the Latin church, where it gradually shed its Roman bureaucratic origins and took on the softer, more lyrical quality characteristic of Welsh phonology. It also has an association with the ancient cantref of Emlyn in southwest Wales, a place-name of Celtic origin that means something akin to "around the valley."
Emlyn Williams — the Welsh playwright, actor, and director — stands as the name's most distinguished twentieth-century bearer. His autobiographical plays *The Corn Is Green* and *Night Must Fall* brought Welsh experience to the stages of the West End and Broadway, and his one-man performances as Charles Dickens were considered definitive by critics of his era. Williams gave the name intellectual credibility and theatrical dash, two qualities that suit Emlyn's melodic, unhurried sound.
Today Emlyn functions as a gently androgynous name — more common for boys historically in Wales, but comfortably adopted for girls in contemporary usage, particularly in North America where Welsh names have found enthusiastic new audiences. It is soft without being precious, ancient without being dusty, and possesses the rare quality of sounding both like a place and a person simultaneously.