Английский Этимологический словарь - jowl

- 1577, from M.E. cholle "fold of flesh hanging from the jaw" (c.1380), perhaps related to O.E. ceole "throat," from P.Gmc. *kelon-. A slightly different jowl, meaning "jaw," evolved from O.E. ceafl, from P.Gmc. *kaflaz. The change from ch- to j- has not been explained.