Who was Carmi?
(1) Carmi was a son of Reuben who came to Egypt with Jacob (Gen 46:9; Ex 6:14; 1 Ch 5:3).
Also the name of a family of which Carmi was the head (Nu 26:6).
(2) A Judahite (1 Ch 2:7), son of Zabdi, according to Josh 7:1, and father of Achan, who is given the name of "Achar" in 1 Ch 2:7. This last form "Achar" is preferred to the usual "Achan" in order to bring out the play on the Hebrew word for "troubler." The Hebrew runs Heb: `akhar `okher yisra'el, "Achar, the troubler of Israel." As regards the phrase "the sons of Carmi" (1 Ch 2:7), Carmi is probably to be taken as the son of Zimri (= Zabdi, Josh 7:1). The Targum, however, has "Carmi who is Zimri." The Septuagint identifies Zimri and Zabdi.
(3) In 1 Ch 4:1, Carmi, elsewhere called son of Zabdi or Zimri, is made son of Judah; but Wellhausen correctly changes "Carmi" to "Chelubai" (compare 1 Ch 2:9).
IBSE, "Isaac" (in the public domain) with minor edits.