Redupl. stem with a secondary n; semantic interpretation should possibly be reverse: ‘bald’ > ‘skulľ.
Tigrinya
ḳʷärḥe - fare qualche segno in fronte ecc. ad una bestia per riconoscerla (make some mark on the forehead etc. on a beast to recognize it)
(TED 925, Bassano 1918: 289)