MAPS (but a simple one I hope)- need county names

Hello

Having spent some time this week browsing through other queries, I can now, thankfully, generate maps in Excel that include Scotland, Wales and Northern Ireland. My problem comes with how to populate those countries. In the UK I can get the counties but the naming conventions for the others have proved a little more elusive. Can anyone point me towards the county names that work for them?

Thanks

MPR