Proto-Sino-Tibetan: ? Proto-Tibeto-Burman: *klu(ː)ŋ ~ *k(l)uk ~ *klyoŋ (Matisoff, STEDT); *kluːŋ (Benedict, 1972; Chou, 1972) This word is fairly common...
Proto-Mon-Khmer: *ruŋ ~ *ruuŋ ~ *ruəŋ (Shorto, 2006) *ruŋ river, channel → Proto-Sino-Tibetan: *kl(j)u(ŋ/k) (“river, valley”) Old Chinese: 江 (OC *kroːŋ...