If I’m not mistaken the latest research on this topic incorporates the results of DNA studies that seem to suggest there was indeed a population replacement (ma

If I’m not mistaken the latest research on this topic incorporates the results of DNA studies that seem to suggest there was indeed a population replacement (made possible in part by the very large number of the Anglo-Saxon immigrants and the very much reduced, as a result of the upheavals after the departure of the Romans, number of Britons). The linguistic evidence has always suggested complete replacement. Even with the prestige language of invaders taking over you would expect some geographical names, especially for small, insignificant and / or out of the way features to persist and yet in England there is pretty much not a single place name that has Celtic origins (outside of Cornwall of course)