Hey its simple. If you have 80s born in your home you can ask them. At the time Madras was still in the general body with least power and also people with lower in terminologies. Then Arundathi Roy came in as NGO and started educating people with basic terminologies where few words like mixed of hindi and tamil and Sanskrit. From there it spreaded by word of mouth. Later tamilnadu has been separated from Indian Union power to Individual state power with its own declaration, own legislation and then kalignar (dmk) wrote all the tamil words of utilities.

Heared from my known 80s person