For Illgen there are 84 on Yasni with different names.
Among the most common last names on Yasni Illgen is on position 4443.
it is an old first name EGIDIUS = is called the "Beschildete", it was a hermit - an abbot from the South of France, who was greatly venerated. He was one of the 14 Holy Helpers - it was the most important saints. The name comes from the Greek = BODOLD of the EIGIS = means shield of Zeus. Eigis = goatskin, ie the sign of Zeus was covered with goatskin From Greek it was about Christianity to the German, was reinterpreted over time to ILLNA, ILLIES, Illgner, Illgen This information I got from Prof. Udolph, MDR Sachsen