The Wright surname has origins from the Eastern Shore of Maryland and Virginia dating back to the late 1600's to early 1700's. The migration path for these Wrights was north to DE, PA, NJ, NY, etc as well as south into the Carolinas and then west.
The Coker and Miller surnames have origins from the Eastern Shore of Maryland and migrated into Delaware and other points north. Both of these lines go back to the mid-1700's.
If your research on these surnames dates back to the above-stated time periods and locations, you very possibly have a connection to these families.