Before entering India, river Brahmaputra is know by which name?

Siang Dihang Luit Tsangpo

Tsangpo

The Brahmaputra also known as the Yarlung Tsangpo in Tibet, the Siang/Dihang River in Arunachal Pradesh, Luit in Assamese, and Jamuna River in Bangladesh, is a trans-boundary river which flows through Tibet, India, and Bangladesh.