Harwan was a late third Age term for Near-Harad or it's inhabitants.It is unknown if the term was of indigenous or Westron origin though it may have been derived from the name of the Harûze.
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"Harwan" appears on early sketches made by JRRT for the Lord of the rings.The term is believed to be influenced or derived from anglo-saxon "Sigel-hearwan", an old name for Aethiopia.