Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
MORGAN
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
From Mor, the sea, and gan, born; the same as Pelagius--born on the sea, from the Greek ??, the sea. Mor, the sea, and gan, by or near--near the sea, a locality.
Surname type: From given name or forename
Origin: Celtic
Region of origin: British Isles
Country of origin: Wales
Religion of origin: Christian
Language of origin: Welsh