We have modern instances where patronymics (or names appearing to be patronymics) will appear in the middle names of Danish profiles.
Under modern Danish name law, the middle name is a special type of name used to save names which a person is later entitled to choose to use as his or her inheritable family name (slægtsnavn). This name is not the person's last name at birth, but it could become the person's official last name later in life or maybe not if the person decides not to change slægtsnavn, so it doesn't fit in other last name or current last name. We reserve the middle name field strictly for this type of name. It is typically used to preserve the name of a parent, grandparent or godparent or person of importance to the child or to preserve a family name from the mother's line or to preserve a tilnavan used for several years that did not become the family slægtsnavn. Because of past naming law and custom, these middle names sometimes look like patronymns, but they really are not true patronyms even when based on the child's father's given name.
However, because of the special status of the real middle name in Danish naming law and the important clues it can give to family history, Project Denmark would very much prefer that the middle name field not be used for any other purpose with Danish profiles of any time period.
Project Denmark generally incorporates Danish naming law into its guidelines on what goes in the LNAB field. In regard to nobility, inheritable family names as slægtsnavn have been required in Denmark since 1526 which goes back before the official start date for Project Denmark, so by our guidelines what is in the LNAB for all aristocrats officially falling within the scope of our Project should not be a true patronym. Whatever name the aristocratic family adopted as their inheritable slægtsnavn is what goes in the LNAB field. Since 1526, that name is rarely a patronym, true or apparent.
For those who were not noble, names that are based on a frozen patronym are still the most common form of slægtsnavn or surname or family name. When it switched from a true patronym changing at every generation to an inheritable family name depends upon what area of Denmark is involved and whether or not the clergy and family followed the royal decrees on naming. Whatever that time was, unless the profile is for someone born in the 20th century who has a true middle name, no name at all, much less any name looking like a patronym, should appear in the middle name field of a profile for a person born in Denmark during the scope of Project Denmark (and to our preference even before the time).
We can't change what guidelines European Aristocrats has or adopts, but to our way of thinking, no profile for a person born in Denmark prior to the 20th century should have any name in the middle name field.
We haven't finished all our guidelines on where to put which types of names for Danish profiles. But based on our discussion and decision regarding tilnavn (use names), it is most likely that we will decide that once the time has passed at which a family was required to and did adopt an inheritable surname, any true patronym that was used by a person will go in the other last name field.
We don't like the terms first, middle and last name at all as they don't fit either Danish naming custom or law. We prefer to use the Danish terms for types of name or to generalize to given names instead of first names and surnames instead of last names. The translations are what cause the confusion.
Given our discussion on tilnavn, I seriously doubt that Project Denmark would ever favor putting any form of patronym in any type of first name field (including Preferred Name) as patronyms are clearly not now and never have been any form of given name.
Project Denmark takes no position on what the Last Name at Birth should be for Danish nobility prior to 1536. We look to European Aristocrats for guidance on that point. But it appears to me that putting patronyms, or anything looking like a Danish patronym, in the First Name, Preferred Name, or Middle Name fields is asking for confusion. They don't really fit in Nicknames either, but that would be more suitable than Middle Name, First Name or Preferred Name. Such names appear to be a much better fit for the Other Last Name Field when they are not the LNAB or the surname when the person died (which is what goes in Current Last Name).
So by process of elimination, if European Aristocrats is interested in my views and those expressed in Project Denmark's discussions, we would prefer these names be moved to the Other Last Name field.