It is possible the name was derived from the Cornovii Tribe who lived in the North of Scotland and in the Severn Valley, near the Wrekin in Shropshire.
The County of Glamorgan is named after the Morgan Princes of South Wales.
[2] In Ireland, Morgan is an anglicised form of Irish Gaelic Ó Muireagáin meaning 'descendant of Muireagán', a clan who were lords of Teffia in County Westmeath and County Longford.
[3] Clan Morgan is the designation for the Mackays of the Reay Country and the surname is also found in Aberdeenshire.
[4] At the time of the British Census of 1881,[5] the frequency of the surname "Morgan" was highest in Brecknockshire (over 16 times the national average), followed by Monmouthshire, Glamorgan, Carmarthenshire, Radnorshire, Montgomeryshire, Cardiganshire, Pembrokeshire, Herefordshire, and Shropshire.