1 Chronicles 18:16

And Zadok the son of Ahitub, and Abimelech the son of Abiathar, were the priests; and Shavsha was scribe;

Abimelech - elsewhere Ahimelech (cf. 1 Chronicles 24:6: see the notes at 1 Samuel 14:3; 1 Samuel 22:20; 2 Samuel 8:17) [Septuagint, Achimelech. So also the Vulgate, as well as the Syriac and Arabic versions]. Drusius remarks that there were two Abimelechs-one the grandson of Ahitub, and the other the son of Abiathar.