Tamil roots of sanskrit words

[Nedunchezhiyan]

Beside all of these religious influences and the belief in supreme being, the current words in use in Thamizh which specify supreme being, such as Iraivan, KadavuL, theivam, Bagavan, are they of Thamizh origin? I have recently read an article in which a Thamizh scholar argued that the word 'Iraivan' indicated King and not Supreme being (GOD). Moreover, the Thamizh Scholar said that 'Iraivan' is a better usage of Thamizh than the word 'Arasan.'

Not only that, the word Theivam is also found in ThirukkuraL in kural such as:
"Theivaththal aakathu eninum muyatsithan
meivaruththak kUli tharum"

Did ThiruvaLLuvar, really said that kuraL? or was it one of the inserted kural? What did Thiruvalluvar meant by Theivam? The word, Theivam is it Thamizh?

The Word Bagavan is believed to have come in usage in the latter centuries. Although the first ThirukkuraL says, "Bagavan"

"Akara muthala ezhuththellam aAthi
bagavan muthattae ulagu"

In which some Thamizh scholars says that bagavan may have been mistook for the word 'bagalan' which meant 'sooriyan.' If so then how about the other kurals under the first chapter 'praising of the supreme being?'

Which other chapters were inserted into ThirukkuraL? What was the original name of Thiruvalluvar? What was the original name of Illango adigaL?

Does Thamizh have a Golden Mean, like the one Aristrotle found for the Western Philosophy? Are words categorized or can be categorized into being different and meaning different in accord with Golden Mean in Thamizh?

nanRi, paNhivu