Charles Ellicott Commentary Daniel 2:26

"The king answered and said to Daniel, whose name was Belteshazzar, Art thou able to make known unto me the dream which I have seen, and the interpretation thereof?" — Daniel 2:26 (ASV)

Whose name was Belteshazzar.— A parenthetic clause, introduced to remind the reader that by this name only Daniel was known to the king .

Are you able.— The king does not pretend to be ignorant of the person of Daniel. He had, in fact, only recently (Daniel 1:19–20) examined him in matters of wisdom and understanding. What surprises him is that after the wise and experienced had failed to tell him his dream, one so young and a mere novice should succeed.