This isn't intended to be a comprehensive list. I'm just going to be periodically updating this list with titles from the following IMDB search parameters:
This list includes people who descend from Ireland and also the British Isles (AKA Channel Islands/England/Isle of Man/North Ireland/Scotland/Wales), unless stated otherwise (ex. Polish but born in Ireland). I was tempted to put "Ireland and friends" in the title but I think we all know that Ireland wouldn't want to be friends with a country with a long history of, well... yeah.
This list previously contained Germanic peoples in general but they have been separated into their own list (https://trakt.tv/lists/11659596) since a lot of white citizens of Australia, Canada, New Zealand, and the United States descend from this particular archipelago. Yay, colonialism?