East Pakistan changed its name to Bangladesh, and it still has this name today, as it's an independent country. Desh means land, and Bangla is the language of people living there.
Nationalism allows people to express devotion to their nation.
The trading route most likely happen by ships through the Mediterranean Sea.
The only option besde that would be by land. But the distance required to do by land is further than those the sea and it has to pass the territory of Greece and Turkey, which will guarantee additional toll payment and reduce the traders' profit.