"II" indicates there was a previous Gundomar. In the Overview, it shows Gundomar I, who is the son of Gebica. He's the second king of Burgundy, but the II doesn't appear after the title. Most MPs seem to prefer entering 1st, 2nd, 3rd etc. before titles. Perhaps there's reasoning I don't know. I'm a somewhat of a novice at this genealogy stuff.
All the best,
Ken