Moses
Genesis 25:2ESV·traditional attribution

She bore him Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah.

Matthew Henry Presbyterian @wholebiblehenry

Abraham lived, after the marriage of Isaac, thirty-five years, and all that is recorded concerning him during the time lies here in a very few verses. We hear no more of God's extraordinary appearances to him or trials of him; for all the days, even of the best and greatest saints, are not eminent days, some slide on silently, and neither come nor go with...

Commenting on Genesis 25:1-10

John Gill Reformed Baptist @doctorgill

And she bare him Zimran,.... That Keturah should bear children who probably, was a young woman, is not strange; but that Abraham, whose body forty years before this was dead should now have any bore to him, may seem difficult to account for, and only can be attributed to the fresh vigour his body was endued with at the generation of Isaac; and which still...

Adam Clarke Methodist @methodicalclarke

Zimran - Stephanus Byzantinus mentions a city in Arabia Felix called Zadram, which some suppose to have been named from this son of Keturah; but it is more likely, as Calmet observes, that all these sons of Abraham resided in Arabia Deserta; and Pliny, Hist. Nat., lib. vi., c. 28, mentions a people in that country called Zamarenians, who were probably the descendants of this person.