This is further complicated by the addition of a second 'middle' name, I 'think' usually applied at the time of Baptism/Christening.
My Grandfather [[Volkmann-135|John Frederick Richard Volkmann (1908-1996)]]. Although, he went by John.
I am not the expert here, but I put the First proper name in the First; additional names in Middle, and the Common name in Preferred.
Also, this is further complicated by the recent discussions of removing the use of the Middle name field.