"Maravarum, Kallvarum, Agamudaiyarrum mella mella maruvi Vellalar aayinare"
The famous Tamil Saying mentioned above shows that Caste is a slow evolutionary process. Therefore, the term Caste, in the past was just used to Describe or Categorize a person according to one's job, duty or a way of life & once they accumulate enough wealth, there must have been CASTE REFINEMENT -UPGRADATION in the old days, unlike now.
KARKATHAR or KARKARTHAR PILLAI / VELLALAR-THEY SAFEGUARDED THE "KAR" -THE CLOUD. THAT MEANS THEY BUILT DAMS TO SAVE RAIN WATER, GUARD THE WATER SOURCE, ABLE TO CREATE OR CALL UPON THE RAINWATER; MAYBE THROUGH RITUALS (Like the Rain Dance of the American (Red) Indians).
VEERA KUDI VELLALAR THEY ARE A SMALL COMMUNITY OF FIGHTERS WHO FOUGHT TO SAFEGUARD THEIR HOMELAND.
MUSUGUNDAN OR MUSUGUNTHAN COMMUNITY IN SINGAPORE
MUSUGUNDAN people are EITHER KARKATHA OR VEERA KUDI VELLALARS. They are mostly located in PATTUKKOTAI in TANJAVUR. People of the community formed a translocal forms of citizenship amongst members of the Neighbouring Villages & fellow Karkatha Vellalar or Veera Kudi Vellalar caste members now in Singapore. Like all transnational communities involved in the production of locality, identity and social viability, these villagers now based in Singapore (immigrant city-state consisting of a diverse ethnic population with the Indians making up the third major group), maintain strong social and cultural ties with their villages in South India.