What does Genesis 25:2 mean?

God had promised to make Abraham the father of many nations (Genesis 17:4). He will clearly become the father of Israel through Isaac and his descendants. Abraham also fathered several nations and tribes through Ishmael, his son by Sarah's servant Hagar (Genesis 25:13–16).

This verse reveals six more sons, all by Abraham's wife Keturah: Zimram, whose people may have settled in Arabia, Jokshan, Medan, Midian—whose descendants become traders in the deserts around Israel; Moses's wife will be a Midianite—as well as Ishbak, namesake of a town in northern Syria, and Shuah, the name of a town near Babylon.

Clearly God kept his promise to make many nations from His much-blessed servant Abraham, as the following verses will continue to reveal.