Focusing on Geert Jochums a bit today, eventually reailsed that over time the spelling changed to Jochems and that his children used it as a surname after 1811.
I cannot find any birth record for a Geert with a father named Jogum, Jochum, Jochem or even Jakob.
It occurred to me that perhaps Jochums as shown on his marriage record is not a patronym at all, perhaps when he marries in 1756 his family is already using a surname?
I suspect that Geert may even have married a cousin.
His wife Roelfijen is the daughter of Aefien Jochems who's father is Jochem Harms Hummelen.
Jochem Harms has 10 children between 1699 and 1718 and four of them have the name Hummelen recorded at their birth, so obviously it is a not yet set as a surname.
It is quite easy to guess that some of his children would eventually have gone by the surname Jochems whilst others used Hummelen.
So is Geert Jochems a grandson of Jochem Hummelen?
