1 Chronicles 1:23

1:23 Ophir, Havilah, and Jobab. All these were the sons of Joktan.

1 Chronicles 1:19

1:19 Two sons were born to Eber: the first was named Peleg, for during his lifetime the earth was divided; ¹  his brother’s name was Joktan.

[1:19]  ¹ sn Perhaps this refers to the scattering of the people at Babel (Gen 11:1-9).