Right now, it looks like these are the names I’m going with:

• Albion
  • Britannia (Imperial for England)
  • Caledonia (Imperial for Scotland)
  • Cambria (Imperial for Wales) / Cymru (Gael / Fair Folk for Wales) – in either case this is Lyonesse in the setting
  • Hibernia (Imperial for Ireland) / Īveriū (Gael / Fair Folk for Ireland)