Nāgercoil. Article #11. Vol 8, pg 483.
Nāgercoil is a city at the southernmost tip of India whose name means “snake temple”, deriving from “Nagaraja”, which is Sanskrit for “king of snakes”. Nagaraja is apparently a five-headed serpent deity. Or possibly it’s the thousand-headed snake upon which Lord Vishnu rests. It’s a little unclear, since Britannica doesn’t elaborate and sources on the web point in a number of directions.
“Nāgercoil.” Encyclopedia Britannica. 15th ed. 2010. Vol 8, pg 483.