The evolution of the name ÆÐELSTAN over the millennia in Wales has IN SOME INSTANCES morphed as follows: ÆÐELSTAN --> ELYSTAN A Political History of Abbey Cwmhir, 1176 to 1282: and the Families of Elystan Glodrydd, Mortimer and the Princes... by Paul Martin Remfry and David H. Williams (Feb 1, 2003) ELYSTAN --> ELYS, ELIS, ELLIS.