perhaps denominative from H3394; (born at the) new moon; Jaroach, an Israelite.
First appearance
1Chr 5:14 These are the children of Abihail the son of Huri, the son of Jaroah, the son of Gilead, the son of Michael, the son of Jeshishai, the son of Jahdo, the son of Buz; (KJV)