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'Jack' is not a word in Irish. The male name 'Jack' would have 'Seáinín' as an equivalent in Irish.
I'm not sure what you mean by 'special name', but the official name for the British flag is: Union Jack
Union Flag, or more casually the Union Jack
Technically it is an Irish name because it comes from the name 'Jackreion' and that was the name of a very Irish person. Then his friend started to call him Jack and so the name was developed.
Union Jack
union jack
the Jack- o- lantern originates from the story of a irish man named jack
Jack is another name for a flag, usually a small flag used for signaling, but in the case of the Union Jack it symbolises the union of the three countries - England, Wales, Scotland
The Union Jack
Actually the Irish used to carve out turnips. They were the one who got the idea of a jack-o-lantern. We just took their name. They got the name after a man named Stingy Jack who delt with the devil.
the union is the part where all the flags of the 3 flags are together. being Northern Ireland, England and Scotland
Union means exactly that - a union, in this case of England, Scotland and Wales. Jack is another name for a flag. A jack is a particular kind of flag.