Its etymology is rumored to be that at one time there was a large reed forest in the vicinity of the area. The reed was sweet, and the name of the village came to Mithabon (মিঠাবন sweet forest) which was corrupted to Mithamon and later Mithamain/Mithamoin in the local dialect.
The etymology of this term is shrouded in mystery, but it is thought to have originated from a dense reed forest surrounding the area. The name "Mithabon" (মিঠাবন sweet forest) was later corrupted into Mithamon and eventually Mithamain/Mithamoin.