The Aranthangi Tondaimans ruled Aranthangi from the 15th to the 18th centuries in southern Tamil Nadu. (As per the copper plates of Tondaiman released by Tamil University of Tanjore). There are references to the Aranthangi Tondaimans in temple inscriptions at Avudayarkovil , Alappiranathan , Palaiyavanam , Pillaivayal , Aranthangi , Kovilur [ disambiguation needed ] , Paramandur , Palankarai , Piranmalai , Thiruvarankulam and Kurumbur . Similarly, the Aranthangi Tondaimans were an independent line of chieftains ruling from Aranthangi; they flourished about 200 years before the rule of the Thondaman dynasty of Pudukottai (which began about 1640). 
See James W. Gair and S. Suseendirarajah,
International Journal of Dravidian Linguistics (Trivandrum)
10, (Jun 1981) 370-384
See phonetic changes in tamilization and regional differences in Tamil.
South Indian Tamil place names often have endings not found in
Sri Lanka's North and East, because SL place names are mostly
derived from Sinhala place names.
Tamil Nadu and Offical Tamil Place names and language Politics. In Tamil Nadu, south India, the population is 60% Tamil speaking, and in 1997 the State government passed a law requiring the use of tamil place names.
Also, Tamil is the only official language even though Telugu, Malayalam and Kannada are large minority languages.
Tamil is also the official first language of instruction for all citizens of Tamil Nadu
South Indian Tamil place names often have endings not found in Sri lanka's North and
East, because SL place names are mostly derived from Sinhala place names.
see for South Indian Place names and references there-in.
See politics in place name changes in India
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