Why Inka with a K and sometimes Inca with a C?

Inka spelled with a K are still with us in Spirit teaching us these Shamanic ways…
through the Q’ero on earth and in Spirit helping to guide our every path.
It has been said Inca with a C are what you read about in history books…

My Q’ero Elder teacher – Don Manuel is now with us in Spirit.
He was not strict about using Inca or Inka, because
“his teachings come from an oral nature, there were no written books”.
Either way is fine, as long as the Sacred teachings are always Respected.