I have an old friend of mine in Hyderabad. He is a Buddhist and lovely fellow. During a talk on telephone I mentioned to him about Meghvansh. He rather reacted by saying that Meghvanshis were from north and Nagvanshis were from Nagpur (Maharashtra). I knew he was an Ambedkarite. His reaction was shocking for me. On further queries I came to know that one of his friends had told him that way. Then I gave few references and made him understand that the origin of both of them was same. Vritra is considered to be the first Megh and described as Vritra Asur (वृत्र असुर) and Ahi Vritra (नाग वृत्र). Both the names have been ascribed to him. Later both the names were used for his further generations and are still in vogue.
Names do divide us.
Pl see this link also Dravidians and Nagas
(Retrieved on 04-03-2011)