“Achan” Joshua 7:1 seems to have become “Achar,” in order to assimilate the word more closely to the Hebrew term for “troubler,” which was from the time of Achan’s sin regarded as the true meaning of his name Joshua 7:25-26.
Related Commentaries of 1 Chronicles 2:7
1 Chronicles 2:7
7 And the sons of Carmi; Achar,c the troubler of Israel, who transgressed in the thing accursed.