1 Samuel 27:2 - Coke's Commentary on the Holy Bible

Achish, the son of Maoch— Most writers agree, that this Achish, to whom David now fled, was notthe Achish by whom he was so inhospitably received, and from whom he so narrowly escaped, when he was before at Gath. His being called here Achish, the son of Maoch, sufficiently indicates that he was another person; for those words can, in the nature of the thing, have no other use, than to distinguish this Achish from another of the same name. And, indeed, this Achish seems as well distinguished from the other by the rest of his character, as by being called the son of Maoch. But here, by the way, is a fair proof that this book was written at the time when it is said to have been written; inasmuch as this distinction was information enough to the people of that age, but could neither be given nor received as such either by any writer or reader of a subsequent period.