Dear Sri Ramesh,
I happen to go through your thread, my maternal grand father is Urupattur Nallan Chakravarthy Narasimhachary who hailed from a village near Kanchipuram called Tahndalam. Only this much I know, they belong to Srivatsa gothram, I belong to Kausika Gothram. Could you throw more light on Urupattur Nallan families? Please email if possible.
Regards,
K.S.Raghavan