It took me a while to work out where the source of this quote was - and to my surprise it was something I wrote myself back in 2015.
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We've got access to much better data than we did 10 years ago, so we can make a much better guess at this number. The answer also depends on whether by "diaspora" you count only men who've inherited the Y chromosome themselves, or include women who have R-P311 up their direct male line. If you count women, then my guess from our current data is somewhere in the region of 600-700 million. If you don't, it's obviously half of this - about 300-350 million.
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To get these percentages, I've estimated the percentage of R-P311 in each country by dividing the R-P311 testers at Family Tree DNA by the A-PR2921 testers, then multiplied that by the population of the country. I haven't been through each country exhaustively, only European countries and the populous ones in which R-P311 is common. Of these 600-700 million, around 175 million are in European countries (in which I'm including Russia and Turkey but not the Caucasus countries). Around 200 million are in the USA, around 23 million are in South Africa, at least 45 million are in former British empire colonies (Canada, Australia, NZ), and at least 187 million are in Latin America.
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- Iain.
