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They probably converted.
Irish people settled all around Britain, so in just about every part of it. Irish people and people of Irish ancestry can be found in any major town or city in Britain.
Because while he was not the first US president with Irish ancestry, he was the first Roman Catholic US president, and he had Irish ancestry of which he was very proud, and used in his campaign to garner votes.
The Irish don't hate Britain. There is a long history between Ireland and Britain, with Britain having invaded Ireland. This long history goes back to 1169, so it is not possible to discuss it in detail here. There is some animosity between Irish and British people but there are also very strong links between the two countries. Many Irish people live in Britain and many people in Britain are of Irish ancestry. The Irish are the largest immigrant group in Britain.
Johnson is not an Irish name. This is not to say there are not Johnsons with Irish ancestry. So no Irish county is associated with the name Johnson.
In reality, only those ancestors are really Irish. The generations after that are of Irish descent, but are now from the country that they now live in. What made those original people Irish is that they were born in Ireland, grew up in Ireland, lived in Ireland, were educated in Ireland and so on. The generations after that would have done all those things in different countries. So the things that made their ancestors Irish are the things that make them be from their own country. So you are not Irish, but you do have Irish ancestry, plus the ancestry of your other grandparents, wherever they and their ancestors may have come from.
Because there are so many people in America that have Irish roots and because there are many Irish here!
Not necessarily, one or both of your parents, grandparents or great-grandparents probably came from Ireland so the fact that you have an Irish surname suggests that you have some Irish ancestry.
In Ireland, or anywhere in the world where there are Irish people. Irish people are found all over the world, so there are many places where you could hear an Irish accent.
There are thousands and thousands of people in Ireland that use YouTube, so there are many Irish YouTubers.
Fitzgerald is Norman, son of Gerald, so no, not at all.
Its impossible to tell, because there were so many people on the ship, many many died so IF there were irish passengers most of them would have died