Bengal (West bengal is the indian part and Bangladesh as eastern part of bengal)
Bonga - an Austric word for Sun god.
Bang - a Bronze Age proto-Dravidian tribe.
Vanga- was a seafaring state located in the eastern part of the Indian Subcontinent.
Vangaladesa or Vangadesam (found in South Indian records about 11th century)
Gauda or Gauro Vanga (found in South Indian records about 12-13th century)
Bangala or Shah-i-Bangala (The Bengal Sultanate in 1500, during the reign of Sultan Alauddin Hussain Shah)
Subah -i- Bangala or Mughal Bengal
Bengala or Portuguese Bengal
Bengalen or Dutch Bengal