Why Caldarifiying it when Kor is of Matari origin ? Unless he was called something caldari from the beginning ofc.
You can also find him a more caldari name that he adopted afterwise and that fits the "Korsavius" nickname as well ? vOv
Did CCP wrote the real name or just your ingame handle "Korsavius" in their articles ?
What I imagine would have happened is his parents (who are Minmatar by ethnicity) would have came up with a Caldari-sounding name for their son since they didn't know how long they would be secret laborers in the State. Perhaps they did it as a way to help him blend in to the society they were forced to live in.
Although, your suggestion about him taking up another name while growing up isn't bad either...hmm decisions, decisions.
The real name was always in my in-game bio, but I had an addendum that his full name was not public.
used the full name anyway in the in-game article.