I think a few people are confused by Dante’s description of his name situation.
i have 3 forenames, two are family names honouring relatives and the 3rd is my given name, the one I am referred to and have been since birth. In order, it is my 3rd name.
Born in the 60s, this was never a problem until probably this century. Previously, I would fill in documents underlining my given name and everything would be in that name. Order didn’t matter. Now with computerisation, credit cards, bank accounts etc have all 3 names on them and when I book airline tickets, I have to book in my first name.
To answer Elliot, if a name is on your birth certificate, whatever the order, it is legal. Unfortunately organisations now will only accept the first name on documents.