Last week the Sri Vaishnava Acharya Srimushnam Andavan departed the Earth. He was the head of a large Vadakalai Matham called Srirangam Andavan Ashramam. As I discuss in this question, both Thenkalais and Vadakalais have Mathams, similar to the Shankaracharya Mathams in Advaita. But a small number of Sri Vaishnavas, known as Swayamacharyas, do not belong to any of these Mathams. They're biological descendants of the 74 original disciples of Ramanujacharya, and for them their father functions as their Sri Vaishnava Acharya. But nowadays this distinction can be blurred, because sometimes Swayamacharya people decide to join one of the Mathams. For instance my family is a Swayamacharya family descended from Ramanujacharya's nephew Mudhaliandan, but in the 1800's we joined Vanamamalai Matham.
Srimushnam Andavan seems to have had a similar situation; here is what his official biography says:
[Srimushnam] Andavan was born in Srimushnam, a Swayamvyakta Kshetra, in South Arcot district, on a Vaikasi Arudra day in Yuva Varsham 03-06-1935 to U. Ve. Srinivasachariar and Sri Kumudhavalli, belonging to the illustrious lineage of Swayamacharya Purushas. His great great grandfather Sri Nadu Nattu Narayanachar was the prime disciple of Annarya Mahadesikan. The Purvashrama name of Srimushnam Andavan was Varahan.
I'm interested in the part in bold. My question is, what is the Swayamacharya lineage of Srimushnam Andavan? That is, what disciple of Ramanujacharya is his family descended from?
The quote says that Srimushnam Andavan's great great grandfather Nadu Naadu Narayanachar was a shishya of Annarya Mahadesikan. I've managed to find information on Annarya Mahadesikan: he was a shishya of Vazuthur Andavan, the disciple of the Vadakalai Acharya Gopala Desikan whom Sri Rangam Andavan Ashramam traces its lineage from. But I haven't found any information on Nadu Naadu Narayanachar, apart from the fact that Nadu Naadu refers to the region of central Tamil Nadu which contains Srimushnam, the birthplace of Srimushnam Andavan.
Does anyone know the Gotra of Srimusham Andavan? That might allow me to narrow down which shishyas of Ramanujacharya had the same Gotra as him.