Is samual l Jackson some kin to shedrick or sheadrick?

There is no publicly available information to suggest that Samuel L. Jackson is related to anyone named Shedrick or Sheadrick. Samuel L. Jackson is a well-known actor, and while he may share a common cultural heritage with many individuals, any familial connection would need to be supported by specific genealogical evidence. If you have a particular Shedrick or Sheadrick in mind, that context might help clarify the inquiry.