Where does “பதினாறு” come from?

பதினாறு (Tamil) comes from Tamil ஆறு, from Old Tamil 𑀆𑀶𑀼, from Proto-Dravidian *cāṯu — six.

Ancestry of “பதினாறு”, step by step

பதினாறு traces back through two separate lines of ancestry.

via Tamil ஆறு

StepLanguageWordMeaning
1Tamilஆறுsix (numeral:௬)
2Old Tamil𑀆𑀶𑀼path
3Proto-Dravidian*cāṯusix

via Tamil பதின்

StepLanguageWordMeaning
1Tamilபதின்ten
2Tamilபத்துten (numeral: ௰)
Every word from Proto-Dravidian *cāṯu →Every word from Old Tamil 𑀆𑀶𑀼 →Every word from Tamil ஆறு →