The Origins of the Arabs

There is a theory that these Jewish tribes were not actually Jewish but they were Arab converts to Judaism. This is a ridiculous theory for one simple reason. If they were Arab convert, we would know where they're coming from. And all Arabs have a lineage to Adnan and Qa'an. The Aus and the Khazrach appear out of nowhere. There is no connection with them at all. Even the names kai'inu, qa'a and qar'il are not familiar to the Arabs. They'reJewish-ised Arab names. It seems Allah, Subh'anaHu Wa Ta'ala intended this. Some people don't like this ancient history