Wow, these seem to emerge all over the globe. I haven't heard about this one, though (I'll read about it).

Every few years somebody comes up with a new solution to the problem of the "lost 10 tribes" - other than the simple solution (some migrated to Judea, others mingled with the populace) - and finds an ancient tribe whose language has amazing similarities to some expressions in Hebrew, and happens to have religious observances which are very similar to the Jewish ones (though this would be an anachronism). They are immediately hailed as "one of the lost tribes", though they can't say which one...