Alluded to in an answer by DVK-on-Ahch-To on separate question, Mopsus is a family name that might be traced.
In Ancient greece, which was between 800 B.C. and 500 B.C., Mopsus was a powerful seer who could predict the outcomes of battle.
Professor Mopsus was a character in the HP era that was cut from her drafts because "he was too good." He was supposed to be a blind Seer whose power was great enough for him to accurately predict future event and that would cut away from the story's drama.
With the same family name, it would be highly likely that they were related.
Other than this, the oldest would be Ollivander as he is a true character in the HP verse and appears at the start of this AD timeline.