Quite important to note that 'many English people' are descended from Saxons is not correct. They had little impact on our wider gene pool. Please see https://www.prospectmagazine.co.uk/magazine/mythsofbritishancestry
It would be better to word the question as 'Germanic tribe that invaded Britain after the Romans' or put the approximate time period.
Oaxaca and Xhosa I knew, I just wasn't sure how to spell! I tried several variations of xosa, xossa, etc and xahaca, xuahaca, juaxaca, etc! Dumb I know, but I would appreciate several varied spellings being accepted for the tricky ones
It would be better to word the question as 'Germanic tribe that invaded Britain after the Romans' or put the approximate time period.
https://en.wikipedia.org/wiki/Genetic_history_of_the_British_Isles
"A 2016 study concluded that on average 25–40% of the ancestry of modern Britons was contributed by Anglo-Saxon immigrants."
Lots of other sources confirm this. The Romans, on the other hand, did not leave much of a genetic trace.