Not sure where it originated. There are different opinions. Jean Manco for instance thought it to be a La Tene marker and I've also read that the oldest was in Devon in England. There are also people that think it originated in Ireland and others think it originated in Scotland. It spread in places in Ireland due to the clan nature of Ireland in that the more powerful the man he would have more wives and women so more children. It is why it is common in areas of the Ui Neill and their related tribe the Connachta.
It has been found in the Cotentin and also Norway and there is a Swedish clade. I haven't looked into why it is in those places. Possibly due to Viking activity and the Swedish one could even be due to Irish soldiers during the Wild Geese era. I'm not really sure as I've only seen these things doing some very cursory reading. I haven't looked into it too much. I would even expect a Spaniard might be M222 due to the Irish Wild Geese that served in the Spanish Army in the 1700s and 1800s. I know O'Neill's Regiment was formed in 1709 in Spain.
Look at this for instance. Now that's really interesting. I never knew about this before looking just now.
https://haplotree.info/maps/ancient_...archfor=R-M222
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