Doctor Nemesis, who gave to his father the name for his (at this time) unborn son, and helped in the delivery.
Cyclops, who started his own family line by going back in time and inspiring his ancestor to adopt the last name "Summers" from him.Night Thrasher had a similar experience.
Traditionally in the Marvel Universe, time travel influencing the past is supposed to create divergent realities. Time is mutable in some circumstances, however, if the changes are too minor to trigger a divergence. And sometimes time travel creates inevitable changes to history.