"British Israelism"
"ANOTHER QUEST FOR THE "TEN LOST TRIBES"

The romance of the ten northern tribes of Israel, apparently lost from the pages of history, has caught the fancy of numerous speculators. The same school of thought which imagined that the wandering Israelites turned into the Afgans, the Nestorians, the Japanese or the Indians of North America has given rise to the British-Israelite theory. They propose that the Anglo-Saxons are the physical descendants of the Israelites and that Great Britain with her daughter America has inherited all the covenant blessings given to Abraham. "

Some people believe this.

http://www.theology.edu/journal/volume4/BritishIsraelism.htm