Title says it all, really - what would William I have called the kingdom he invaded? I'd be curious to know the Norman names for Ireland, Scotland, Wales, and Britain as a whole as well if possible.
In Anglo-Norman England was Engleterre, or Engleter, Engletere, Engletterre, Engliter, Englitere, Engliterre, even Englestre.
Ireland was Irlande, Yrlande, Irlaunde, Yrlaunde, Irland, Yrland, Irlaund, Yrlaund, Irelande, Yrelande, Irelaunde, Ireland, Irelaundie, Irlond, Irlonde, Irelond, Irelonde, Hirland, Hirlaund, Hirlande, Hirlaunde, Hyrelaunde, Hyrlonde, Illande Foedera, Irlannde, Irlaunde, Irlant or Irlende
Wales was Gales, Galees, Galeys, Galez, Galis, Galleis, Galles, Galois, Gals, Galys, Guales, Gualles, Guallez, Gwales, Waels, Wales, Wals, or Walays.
Edit: Scotland is Escoce, Escocz, Escose, Escosse, Escoz, Escocie, Eschoce, Escoces, or Escocez.
Go to here and search "Engleterre", "Wales", "Escosse" and "Irlande."