So, I looked up Chew Magna, North Somerset.
Lay and religious holdings formed an episcopal property held, as overlord, by Giso, the last Saxon bishop and the name Magna comes from the Latin meaning 'the greater'. This is supported by the Domesday Book which was made to specify the 1086 and the pre-conquest holder, in both instances given as the "Bishop of Wells". Hence its benefice was from the early medieval period converted from a rectory to a vicarage, with substantial tythings adjoining named Bishop Sutton, Knowle with Knighton Sutton, North Elm, and Stone. Furthermore, it had the living of Dundry annexed to it.
Since about 1600, the name changed to Chew Magna as this has been the most important of the several villages along the banks of the River Chew and reflecting the reduced wealth of the established church from the Dissolution of the Monasteries onwards.
Then I looked up Weston-super-Mare, also in North Somerset.
Super mare is Latin for "upon the sea" and was added to distinguish it from the many other settlements named Weston in the Diocese of Bath and Wells.
Higher usually means up a hill, as compared to Lower being in a valley.
So, I agree with BB!