The legend of Dhanushkodi
The Moola Ramayana has notes which explain that Lord Rama had received the 'Shiva Dhanush' (bow of Shiva) from Parashurama. He had then given the bow to the king of the oceans for safekeeping. When venturing into the battle to reclaim his queen Sita, Lord Rama requested the king of seas to return his 'Shiva Dhanush' at this point in the land. And that's how the place got the name Dhanushkodi.