I'm sorry I don't have any information on etymology of Kerala but I would like to give you some more information on the demographics. 250,000 residents were reported to undergo treatment for cancer in April 2016. This was reported by the Economic Times. 
 That's horrible. Thank you for the information. 
 Kerala is known to be the cleanest and healthiest state in India. 
 That's good. Anything else on demographics you can share? 
 That's great! What can you tell me about the etymology there?
Kerala is known to be the cleanest and healthiest state in India.