I find it rather interesting how the name of FATHER JACOB KRUIZE morphed over time.  Notice how Jacob's father changes (the patronymic).  Dates given are death dates in the order of their respective deaths.

1806 - TRYNTJE - JAKOB KRUIZE

1833 - SYBOLD - JAKOB HINDERKS KRUISENGA & EISKE JAKOBS DAM

1847 - EGBERT - JAKOB KNELLIS KRUIZINGA & EISKE JAKOBS

1854 - HINDRIK - JAKOB KORNELLIS KRUIZINGA & EISKE JACOBS

1865 - DERK - JACOB CORNELIS KRUIZENGA & EISKE JACOBS

1865 - KLAAS - JAKOB KLAASSENS KRUIZENGA & EISKE JOHANNES

1867 - JACOB - JACOB JACOBS KRUIZINGA & EISKE JACOBS VAN DAM

1877 - STIJNTJE - JACOB JACOBS KRUIZINGA & EISKE JACOBS VAN DAM

Are there any hidden clues in the above?  Initially it may have been thought that Hindrik Jans was the father of Jacob.  Or at least he assumed the name.  But then through the period of 1847-1865, we see the name with various spellings of Cornelis, with the single exception written on the death certificate of son Klaas: but the name of Eiske is also botched leading me to believe that someone just did not know what they were talking about.

Then something interesting happens.  Suddenly we have unified names in the deaths of both Jacob Jacobs and Stijntje Jacobs.  Why was the patronymic "Jacobs" expressed in both places?  Why not "Cornelis"?  Interesting too that both these records utilize the FULL NAME of Eiske Jacobs van Dam.  Why??

Today I was searching for an earlier civil record event that might shed some light on our elusive Jacob Cornelis ancestor.  I found the wedding record for Jacob Jacobs Kruize and his bride Ida Jans Kat which took place on 5 Sept 1813 in 't Zandt, Groningen.  Besides mentioning Jakobs Kornelis Kruize by name, Jacob Jacobs' uncles (mother's side) Egbert and Derk Dam and his older brother Hindrik signed the document (see below).

I have posted pictures of the home location of Jacob Jacobs Kruizinga and family - parcels B361/B362 in the village of Leermens, Groningen.  See here.