Analysis of information sources in references of the Wikipedia article "Badaganadu Brahmins" in English language version.
In Tamil Nadu, the Madhwa Brahmins are migrants from Karnataka. They have six sub-groups, they are Aruvela, Aruvanththuvakkalu, Badaganadu, Pennaththurar, Prathamasaki and Desastha and Badaga. They are concentrated in the Madras, Coimbatore, Coonoor and in Ooty.
Among the Badaganadu families, seven happen to be the Shavites and followers of Shankaracharya while the other one is a Madhwa and followers of Madhwacharya. Marriage between these two sects is permissible.