(British.) The woody vale.
Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
There are approximately 844 people named Glyn in the UK. That makes it the 7,963rd most common surname overall. Out of every million people in the UK, approximately 13 are named Glyn.
British Isles
Wales
Welsh
Christian
Celtic
From given name or forename
Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.