I'm currently researching the Mary Alexander b ~1865 Cadoxton, Glamorgan, Wales dau of David Alexander b ~1815 Ystradgunlais (Ystradgynlais), Brecknock, Wales. Also Hopkin Alexander b ~1782 Bettws, Carms, Wales.
Alexander appears to be a fairly rare name in Wales. There were only about 250 Alexanders in the whole of Wales listed in the 1881 census. Many of these appear to live in the Ystradgynlais area. These Alexanders appear to have originated in Bettws, Carmarthenshire. Any information would be most welcome.