Ewin is of Welsh origin, meaning 'youth' or 'young'. It is a variant spelling of the more common Evan. The name gained popularity during the Middle Ages and was often used as a pet form of Ewen, which itself derived from Owain, a Welsh name with the same meaning.
The name Ewin has been relatively consistent in its popularity over the past century and a half, with an average of about five births per year. However, there were two notable spikes in popularity: one in 1922 with nine births and another in 1924 with eleven births. The most recent recorded birth was in 1953.