The Bunts of Tulunadu who have close relations with uses surname NAYERA,MENAVA etc .These names have no connection with dogs.DONT trust Sadasivan.He is a big Bastard and a follower of SN guru.Etymology for nair can be obtained from malabar manual,travancore state manual,cochin population sensus etc .These are reliable sources.WHY then going for sadasivan,who was not even a historian.