The 1901 Jewish Encyclopedia
Name given by the chief of the eunuchs to HANANIAH (Daniel 1:7 et passim). Various theories as to its etymology have been put forward, of which the most likely (Delitzsch, "Liber Daniel," ) seems to be that the name is the Babylonian "shudur aku" (= "the command of the moongod").
These files are public domain.
Singer, Isidore, Ph.D, Projector and Managing Editor. Entry for 'Shadrach'. 1901 The Jewish Encyclopedia. https://www.studylight.org/encyclopedias/eng/tje/s/shadrach.html. 1901.