What Babylonian name was Daniel given?

Answer: Belteshazzar

The chief official renamed Daniel Belteshazzar. Belshazzar, a similar name, belongs to the Babylonian king of Daniel 5.

“The chief official gave them new names: To Daniel he gave the name Belteshazzar; to Hananiah, Shadrach; to Mishael, Meshach; and to Azariah, Abednego.”— Daniel 1:7 (BSB)