Sackrider is the english version of a family name of immigrants from Strasburg Germany who came to the US in 1731. The name means Saxon Horseman. Sachen or Sack is old German for Saxon. Rider is horseman.
When naming someone the occupation was most important. In this case horseman or "rider" in German "reuter" The next task was to distinguish between various reuters. The ethnicity or other characteristics were used, in this case Saxon, or Sachen, shortened to Sack. German Sachenreuter, to English Sackrider.