‘But at last Daniel came in before me, whose name was Belteshazzar, according to the name of my god, and in whom is the spirit of the holy God, and I told the dream before him.'
At length Daniel arrived, possibly having been recalled from some distant city. And Nebuchadnezzar draws attention to the fact that his name has within it a syllable that connects with the name of Bel, the name of one of Nebuchadnezzar's gods. (It was quite common to use word play when dealing with names). The fact that he saw that as significant may suggest that ‘in whom is the spirit of the holy gods' in his eyes refers mainly to Bel. But Daniel and his readers would connect it with the Spirit of God. Then Nebuchadnezzar told Daniel his dream. His confidence in him was such (as he now revealed) that he felt no need to test him out.
We may see the use of the name Daniel as due to the influence of Daniel, or even introduced by Daniel (thought of as meaning ‘God judges on my behalf') when he copied the decree for Israelite consumption, to stress that it was God who would judge and make clear the dream. Nebuchadnezzar would use the name Belteshazzar.