Owiny Sigoma was possibly the brother of Barack Obama (1961)'s 6th Great Grandfather Ogelo. Their common father was Kisodhi (bef1591), son of Jaduong Owiny (Owiny the Elder). Owinyi the elder is possibly Owinyi Rac Koma (c1544-c1571), due to the known dates for his life, the birth date of Owiny Sigoma before 1607, and Sigoma's lineage to a leader named Owiny who was his grandfather.
"Kisodhi was succeeded by his aggressive and impulsive son Owiny Sigoma who led a section of Joka- Owiny to Alego.
...The Owiny Sigoma group arrived in Alego around 1625 where they found parts of Alego still settled by Bantu speaking people, with whom they fought. They then joined the original Luo immigrants who had occupied the region under the leadership of Alego. The followers of Dimo and Owiny Sigoma migrated together to Alego, leaving the present Ababongo people in Bunyala...
"Owiny launched a serious attack on the new comers, killing many of them but before he could bring them under his control, a second party of the Jo-Ugenya led by Boro and Puny, the founders of the Boro and Puny clans, appeared. B.A. Ogot has written thus:
Crossing the river Nzoia and using clever military subterfuge, the group routed Owiny's army and in the ensuing fight, killed Owiny himself." (Source:Ng'ang'a)
Sources and notes
The genealogy related by Sarah Obama and recorded in Dreams of my Father has names and order of lineage that correspond to historically established figures. Sarah stated that Owiny was a warrior leader who fought the Bantu armies and that his son's name was Kisohi. Ng'ang'a identifies Jaduong Owiny (Owiny the elder - Owinyi Rac Koma (c1544-c1571)?) as the warrior leader who led his clan out of Uganda, battling the Bantu speaking Bugwe tribe in Samia, and that his son was Kisodhi. Sarah states that Kisodhi fathered Ogelo, Barack Obama (1961)'s 6th great grandfather. Ng'ang'a mentions Kisodhi's son Owiny Sigoma who took over leadership of the clan, but does not mention Ogelo.
<<citation ^^last=Obama ^^first=Barack ^^year=1995, 2004 ^^title=Dreams from My Father^^Dreams from My Father: A Story of Race and Inheritance ^^location=New York ^^publisher=Three Rivers Press ^^isbn=1-4000-8277-3^^pages=394-395>>
According to Ng'ang'a, Alego was invaded around 1625 by the Luo under Owiny Sigoma. To lead such a group, Owiny would have to be at least 18 years old, meaning his birth would have to been prior to 1607.
According to Rafiki, "The people of Jaduong Owiny referred to as Joka Owiny broke away from the Adhola of Uganda and arrived in Alego around 1620, fought against local Bantu and settled in the land gained in battle." This would mean for the warrior Owiny to have led in battle he would be in a physical prime of 18 years at minimum, putting his birth at sometime before 1602.