The spreading of the name
The name was spread by sons of generations who elsewhere find his place to be. Some of them certainly did not originate from the same forefathers. The family tree make that already clearly.
The change in blood relationship could have been changed by female bloodlines if they remained on the courtyard because there was no successor son. They married with a farmer’s son from elsewhere who adopted the name Koebrugge from the courtyard. Farmers on the original courtyards were and always have been Catholic.
It was different for departing sons. Especially for the group to the west and north of the Netherlands. Due to the Reformation (iconoclasm 1566), some have mostly switched to the reformed or reformed church for practical reasons, following the thane or vassal of their area and switched also to the Dutch Reformed or Calvinists church.