I learned that the word ‘darth’ means ‘neighborhood’

"Darth" is indeed Chondathan and predates the settlement of Sembia, but it's a corruption of the Chondathan word, which is "darthan" and means neighbourhood or known small, specific locale, or "group of dwellers" (= neighbours who flee war or disaster together).#Realmslore

— Ed Greenwood (@TheEdVerse) May 30, 2021