Inca or Inka, Which Spelling Is Actually Correct?

Have you tried typing inca or inka in a search engine hoping to find your answer quickly? You have probably noticed that the two spellings are used indiscriminately, without any indication about which one is correct. There is more depth to this matter than meets the eye. Depending on whether you are researching Peruvian history, traveling in Peru, or just trying to get the spelling right in an academic paper, the answer varies from case to case.