There are several conflicting accounts regarding the origins of Doubell progenitor Michael George.
According to "Suid-Afrikaanse geslagregisters" he was born in Kent, England, the son of Michael George snr. and Maria.
However, no record has been found of a Michael George Doubell being born in Kent c.1800.
In addition there are many legends regarding M.G.'s arrival in South Africa; this is just a sampling collected by Millicent Emslie: "he 'jumped ship' and landed up in SA; he killed a man in an illegal boxing tournament & was sent here by his commanding officers; he was incarcerated on Robin Island & swam ashore." - http://archiver.rootsweb.ancestry.com/th/read/DOUBELL/2002-09/10328...
At the moment, the first known record of M.G.'s presence in South Africa is his 1827 marriage record to Aletta Maria de Lange. According to Millicent: "His name is recorded as "George Dobell"", with his first name, Michael, in brackets.
Another possibility is that his original surname was Double; a MyHeritage.com tree has the information that he was born George Double, c.Dec 1799, allegedly deserting his ship at Gibraltar - http://www.myheritage.com/person-1000162_1_44586681/Michael+George-...
"The first Doubell anyone can remember, says Gloria, is Bebe, said to have fled from France to England after killing a man in a boxing match, and from there on to Africa, sometime in the early nineteenth century."
Emma Brockes book "She Left Me the Gun: My Mother's Life Before Me" includes her search for her families roots, which includes the Doubell family. Emma's grandmother was Sarah Salmiena Magdalena Doubell; she doesn't appear to be on the Geni tree yet. https://encrypted.google.com/books?id=--GyWE0hwAgC