Meaning and Name Origin
Shadrach \sh(a)-dra-ch, shad-rach\ as a boys' name is of Babylonian origin, and the meaning of Shadrach is "command of Aku". The Babylonian moon god was Aku. In the Old Testament, one of the three Hebrew men thrown into a fiery furnace by King Nebuchadnezzar and rescued by an angel. Used steadily in the 16th-19th centuries.
For more on this name, see also the related boy name Meshach.
Shadrach is a rare first name for males. Shadrach is an equivalently unique surname too for both adults and children. (2000 U.S. Census)
Below is a graphed comparison of the usage of the boy name Shadrach and associated names. The only prominent related form of Shadrach (#unlisted) is Shad. This boy name was at the top of its popularity during the years 1970-1979 and has become significantly less popular since. (Top 1000 Birth Names Statistics, 2014)