Sketty.—An Anglicized form probably of Is Ketti.  Maen Ketti signifies the stone of the Arkite power.  The place was called Is Ketti from its situation at the base of the hill where Maen Ketti stands.  Is means below or under.  English name—Underhill. (Handbook of the Origin of Place-Names in Wales and Monmouthshire, Morgan, 1887).

... there exists a local legend, which resembles that told of Idris in Merioneth, and probably of most giants; namely, that Arthur, one day at Llanelly, being annoyed by a small pebble in his shoe, took it out and flung it on Cefn Bryn, and hence its name.  It was, however, known at a period earlier than this legend, as Maen Ketti, the stone of Ketti, a name probably of Gaelic origin, and which may be compared with Drum Keat in Ireland, called Dorsum Ceti by Adamnan.  It is probably a trace of the early Gaelic settlement in Gower, Kidwelly, and West Wales.  Ketti appears to have been the name of a saint, from whom Sketty has been so termed; while it occurs also on the opposite coast of Pembroke in Cil-getti, or the church of Ketti. (Archaeologia Cambrensis, CAA, 1861).