Jokshan in Wikipedia
Jokshan ("an offense", "hardness", or "a knocking"); most
probably Josephus' Jazar. According to the Bible he was the
second son of Abraham and his concubine Keturah, whom he
wed after the death of Sarah. Jokshan had five other
brothers: Zimran, Medan, Midian, Ishbak and Shuah ; as well
as two half brothers: Ismael and Isaac.
Apparent and approximate emigration patters of Abraham’s
children to Katurah, excepting those of whom insufficient is
known to draw a conclusion.
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 and Dedan. Dedan had three
sons, named Asshurim, Letushim, and Leummim.