Allow me to clarify what i intended to say and correct any refernces to entries on the profile form .
a) Aliases / Nick names : the habit of using nicknames has died only within my lifetime. In the 70 it was abandoned by the young post 69 teenage generation , however you would rarely find official documents that mentioned those nicknames. in the 19th century (before WWI) those nicknames would turn up in patronimics, like "Jan van den bult" his father was nicknamed "den bult" (the hump or hunchback) in real life and in conversations people would refer to other people by their full name but by a designation e.g. mij grand mother would be referred to as "Victorine van Minneke Paepen" (her mother) but cousins on her fathers side would refer to her as "Victorine van onze Mus" (her father was called Guillermus).
My adoptive grand father was called "den boer" (the farmer) not because he exploited a farm, he lived in the town centre miles form the nearest farm land, but because the cafe/tavern he ran as a publican was called "den Boer van Tienen" (located at the beginning of the medieval main road Antwerp-Mechelen-Leuven -Tienen
b) names in fields on the profile form, my advise is the following:
1- Multiple first names
if you have official documents such as a person's birth or death certificate, marriage act or births certificates of children
* the first name of multiple given names on a personś birth certificate is the proper first name ( in the case of my grandmother that is Joanna, instead of Victorine she used as her first name, Victorine should go in preferred name)
* in case there are 3 names: most commonly the 2nd and third names are those referring to the godparents of the child and they should IMHO go into middle names , because they are officially and semi-officially used in that way ( in the sense that they can be omitted and/or sometimes have to be mentioned as abbreviated initials)
2 in the case of compounded names like marie-jose or jean-pierre ( iirespective of the use of the hyphen in the middle) where the first part is a very common first name then the double name with or without hyphen should be used in the First name field,
Sometimes the deduction of the compounded name is made easy because the child has been given 4 names : a compounded first name and the 2 middle names of his godparents
3 based on other documents such as marraige acte, birth declarations of children and census documents the preferred names can determined e.g. my great grand father was called Adrianus Ernestus, and went by the name of Nest ( his preferred name) on another formal document he was mentioned as "Ernest" which confirms his preferred name
4 Nick names could go into the "Other names" field
Finally I would like to clairfy my remark about nicknames and census documents
Although I haven't used belgian census documents yet, I don't expect then to give indications of aliasses, common or nick names, but at best i expect these documents might provide indications as to what name the person used as his first or given name ( his preferred name) and its more popular translation,
e.g. a man called "Constantinus" might use officially "Constant" or "Stan" as his preferred first name,; or my grandmother Joanna Victorine using her Victorine as her preferred name instead of Joanna, while all official correspondane would be adressed to her as Joanna.
Hope this clarifies what is wanted to say before