It is too much of a generalisation,I wish to point out there is a clear distinction in customs and practices of the brahmins in KeralaMost of the Tamil speaking brahmins in Kerala have roots in Tamilnadu only. From my native village near Tiruvarur, people have migrated to Payyanur (near Cannanore) in Kerala. Similarly from one more village near Sirkazhi people have migrated to Trichur, Kerala. All these people come to the native villages in search of `Kula Deivam' now and when we discuss in detail, we are able to locate their forefathers.
Let us try to help this gentleman also in locating his roots.
You have been wrongly informed.I have roots in the old Malabar Dt (now Trissur Dt) The namboodris are different from Nambiars.Nairs are Kshatriyas.In most of the Kerala Temples which follow the Parasurama AAgama the priests or tantris are Namboothris and they are more well versed from the VedasSome of my Malayali friends told that there are no brahmins who originated from Kerala. The Namboodiris or Nambiars are the eldest males from Nair/Menon communities, devoted to temple duties and they are not brahmins by birth.
All the brahmins - only Iyers - are all from migrants from Thanjavur area, who came to Kerala to serve the Travancore and Cochin rulers.