Do I still index this person, even if it is stamped cancel?

Nathaniel Simon Notheisen

https://www.familysearch.org/indexing/batch/db800679-5133-4536-9be6-bc59638dbb9b

erutherford

Yes. Under General Indexing Guidelines/Crossed-Out, Corrected, Canceled, or Void Information of the Project Instructions:

When information was crossed out, was not replaced, and can be read, type the crossed-out information.