Jokshan; most probably Josephus' Jazar. According to the Bible

Bible

The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...

 he was the second son of Abraham

Abraham

Abraham , whose birth name was Abram, is the eponym of the Abrahamic religions, among which are Judaism, Christianity and Islam...

 and his concubine Keturah

Keturah

According to the Hebrew Bible, Keturah or Ketura was the woman whom Abraham, the patriarch of the Israelites, married after the death of his wife, Sarah. Keturah bore Abraham six sons, Zimran, Jokshan, Medan, Midian, Ishbak, and Shuah....

, whom he wed after the death of Sarah

Sarah

Sarah or Sara was the wife of Abraham and the mother of Isaac as described in the Hebrew Bible and the Quran. Her name was originally Sarai...

. Jokshan had five other brothers: Zimran

Zimran

Zimran , also known as Zambran. was according to the Hebrew Bible the first son of Abraham, the patriarch of the Israelites, and Keturah whom he wed after the death of Sarah...

, Medan

Medan (son of Abraham)

According to the Bible, Medan ; also spelt Madan was the third son of Abraham, the patriarch of the Israelites, and Keturah whom he wed after the death of Sarah...

, Midian

Midian (son of Abraham)

According to the Hebrew Bible, Midian is the fourth son of Abraham by Keturah, the woman Abraham married after Sarah's death. His brothers are Zimran, Jokshan, Medan, Ishbak and Shuah....

, Ishbak

Ishbak

Ishbak , also spelt Jisbak and Josabak. According to the Bible he was the fifth son of Abraham, the patriarch of the Israelites, and Keturah whom he wed after the death of Sarah...

 and Shuah

Shuah

Shuah , also known as Sous, was, according to the Bible, the sixth son of Abraham, the patriarch of the Israelites, and Keturah whom he wed after the death of Sarah...

 ; as well as two half brothers: Ishmael

Ishmael

Ishmael is a figure in the Hebrew Bible and the Qur'an, and was Abraham's first born child according to Jews, Christians and Muslims. Ishmael was born of Abraham's marriage to Sarah's handmaiden Hagar...

 and Isaac

Isaac

Isaac as described in the Hebrew Bible, was the only son Abraham had with his wife Sarah, and was the father of Jacob and Esau. Isaac was one of the three patriarchs of the Israelites...

.
Josephus records that "Abraham contrived to settle them in colonies; and they took possession of Troglodytis and the country of Arabia the Happy, as far as it reaches to the Red Sea." Abraham in all probability, tried to keep them apart from Isaac to avoid conflict while fulfilling God's commission to spread out and inhabit the globe.

Jokshan became the father of Sheba

Sheba

Sheba was a kingdom mentioned in the Jewish scriptures and the Qur'an...

 and Dedan

Dedan

The word Dedan means "low ground". The people are called Dedanim or Dedanites.In the Bible, it can refer to either:* A son of Raamah . His descendants are mentioned in Isaiah 21:13, Ezekiel 25:13 and Ezekiel 27:15...

. Dedan had three sons, named Asshurim, Letushim, and Leummim.