No , kalinga was the ancient name of orissa while the ancient name of Bengal is unknown .
Kalinga
Assam
Before the arrival of British to India it was known as "Kalinga Sagar".
Odisha
2
It depends on which king of Kaling you are referring to, but the king of Kalinga during the Kalinga War was Raja Anahatha padmanabhan.
Pragjyotishpur
eri
assom
Kamrupa
Officially it is not recognised. It is just a verbal name due to its name Assam. It is called valley because majority land is valley. Actually the state has two valley - Brahmaputra and Barak valley. These names came from two main river of the State. With the name of Assam valley people wanted to indicate about whole state.
The population of Kalinga is 182,326.