S. D. writes: I’m German American. Half my family is Prussian German and the other half is from Munich in the South. I can answer this, sort of.
English is actually from Denmark.
These folks were never from Germany, they were from Saxony and Angles They were Scandinavians.
Normans brought a great deal of Latin words into the English language but they themselves were Norwegians.
Brits have no German in them. They are Scandinavian and Celtic. Their language reflects this.
Wait a minute. English is a West Germanic language. It is in the same branch of Germanic as German. The most closely related language to English is Frisian, which is spoken as probably up to seven separate languages in Northwestern Netherlands and Northwestern and Far Northern Germany.
Scandinavian is North Germanic. All of these languages are straight up from Old Norse.
English is up from Old German, or more properly the Anglo-Frisian branch. Frisian is straight up from Old Saxon, which gives you a clue to what the Anglo-Saxons were speaking.
A man who knows how to speak Old English recently went to Frisia with a TV crew. He stopped and talked to an old farmer who was a Frisian speaker. He could actually communicate with this guy with him speaking Old English and the farmer speaking Frisian (“Modern Saxon”). If you look at Old English, it looks like German. If you hear a tape of someone reading Beowulf, it sounds like someone speaking German. Not only that, but you cannot understand a word.
The British are mostly a Celtic or even a pre-Celtic people. On top of that is layered some German (the Anglo-Saxons), some French (the Normans) and some Danish on the east and north, formerly the Daneland.
I have heard stories about the Normans being Vikings or Norwegians, but I am not sure about that. They were living in France when they invaded. One of my distant ancestors is Eleanor of Acquitaine, Queen of England. She was from the West Central Coast of France.
The Normans brought a lot of French words into English. Actually they spoke Norman, which is a completely separate language from French and is still alive to this day, though it is endangered. But it is related to French. Norman split off from Old French in ~800-1000 CE.
The Scottish and especially the Irish have a lot of Scandinavian blood in them due to a lot of Viking raids in those places. That is why there is all the red and blond hair and green and blue eyes there (red hair and green eyes in Ireland and blond hair and blue eyes in Scotland).
It is true that a lot of Latin borrowings came into English during the Norman period and even afterwards, as Latin was the language of science, technology and government. Some Danish words did go into English from the Daneland. Scots and a lot of the incomprehensible English dialects from northeastern English such as Geordie have heavy Danish influence.
However, there is a little something to your theory. The three tribes in that area that all invaded England were called the Angles, the Saxons and the Jutes. The Angles and Saxons lived from northeastern Netherlands through Northwestern and Far Northern Germany, but the Jutes actually did inhabit Far Southwest Denmark. They speak a language down there called South Jutish, and I am told that Danes cannot understand it at all. However, I have heard that a Jutish speaker and a Scots speaker from Scotland can actually somewhat communicate along the lines of the Old English speaker and the Frisian farmer!