Answer:

Harappa is a derived form of the Tamil word Agappa which is found in sangam Tamil literature. A well fortified Citadel within a huge surrounding fort is called Agappa in Tamil. Agappa definitely will have a deep moat outside and iinside. Thaeri in Tamil means a high sand meadow caused by whirlwind. Tamil Thaeri has become Daro in Dardic languages. Madinthor means the dead people in Tamil. It became Mohenjo and added the word Daro with it .