I'm very fond of this name. It can be shortened to Shad as a nickname. A fairly prominent character in Irene Hunt's Civil War story Across Five Aprils was Shadrach Yale.
Shadrach Dingle is the name of a character in the British soap, Emmerdale. A lot of the Dingles have Biblical names, such as Zack, Cain and Debbie (Deborah) but they aren't particularly religious!