וַיָּ֧שֶׂם לָהֶ֛ם שַׂ֥ר הַסָּרִיסִ֖ים שֵׁמ֑וֹת וַיָּ֨שֶׂם לְדָֽנִיֵּ֜אל בֵּ֣לְטְשַׁאצַּ֗ר וְלַֽחֲנַנְיָה֙ שַׁדְרַ֔ךְ וּלְמִֽישָׁאֵ֣ל מֵישַׁ֔ךְ וְלַעֲזַרְיָ֖ה עֲבֵ֥ד נְגֽוֹ׃
Kepala para pegawai istana memberi mereka nama-nama lain: kepada Daniel ia memberi nama Beltsazar, kepada Hananya nama Sadrakh, kepada Misael nama Mesakh, dan kepada Azarya nama Abednego.
Rashi
Belteshazzar He named him after the god of Babylon, which was called Bel, as it is said (4: 5): “whose name is Belteshazzar, like the name of my god.” Teshazzar is the Aramaic expression denoting wisdom.
Ibn Ezra
[Daniel 1:7] Vayasem (וַיָּשֶׂם - And [the chief officer] set/gave): Just as Pharaoh gave Joseph the name Zaphenath-paneah [Genesis 41:45]. And Rav Saadia [Gaon] said: that Bel [in Belteshazzar] is a Chaldean name/word, and likewise -Tzar [as in Belteshazzar, Nebuchadnezzar]. And similarly [names like] Nebuchadnezzar, Belshazzar, Sheshbazzar [contain these elements]. And the name Bel is explicitly [linked by Nebuchadnezzar himself when he says about Daniel/Belteshazzar] “according to the name of my god” [Daniel 4:5]. And [Saadia also states that] Shadrach [and] Meshach are Chaldean language [names]. And the Gaon [Saadia] said that Nego [in Abed-nego] is like Nebo [the name of a Babylonian deity], but [this is asserted] without proof.