Besides Shad, another nickname is Drach (pronounced Drack). Think Dracula.
― Anonymous User 10/14/2021, edited 1/7/2025
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There is a concentration of people in South Wales with the surname Shadrach. I believe they are related. There was a well-known Welsh minister, teacher and author Azariah Shadrach, 1774-1844.
https://www.geocities.ws/seraphim_angel_2002/GypsyCensus61.html -- Shadrach Herne 37 Basket Mkr Buckinghamshire
https://www.geni.com/people/Shadrach-Boswell/6000000179830203902