Hi Jane Ellen,
I know it has been a long time since anyone posted on this thread, but hopefully this reaches you. Did you ever find out any information about the Lloyds in Dolwyddelan? My husband is a descendant of John William Llwyd (b. 1711 and married to Catherine vch William) and his father, William Lloyd (died in 1743, married to Catherine Lewis). Do any of these names ring a bell?