It depends on the culture that arises after the initial inhabitation. Maybe after thousands (or even only hundreds) of years, the culture shock of starting a new society on a new planet will have caused the origin of the society to be lost to the past.

However, if this were to happen I doubt that the leader of the first colony would be remembered.

UNLESS the people who first settled decided to raise their kids under the impression that there was nothing before the "new" planet and that they were the second generation EVER, but that would be really messed up.