These were the descendants of Ham, identified by clan, language, territory, and national identity.
Sons were also born to Shem, the older brother of Japheth. Shem was the ancestor of all the descendants of Eber.
References for Genesis 10:21
The descendants of Shem were Elam, Asshur, Arphaxad, Lud, and Aram.
The descendants of Aram were Uz, Hul, Gether, and Mash.
Arphaxad was the father of Shelah, and Shelah was the father of Eber.
References for Genesis 10:24
Eber had two sons. The first was named Peleg (which means “division”), for during his lifetime the people of the world were divided into different language groups. His brother’s name was Joktan.
Joktan was the ancestor of Almodad, Sheleph, Hazarmaveth, Jerah,
Hadoram, Uzal, Diklah,
Obal, Abimael, Sheba,
Ophir, Havilah, and Jobab. All these were descendants of Joktan.
The territory they occupied extended from Mesha all the way to Sephar in the eastern mountains.