Specifically, what came of the people? Did they hold some minor titles, are there even any historical records of their existence after Pepin the Short took the crown?
So Pippin III (or the Short) had himself elected by the leading nobles of Francia, with the knowledge the Pope was on his side. He then sent Childeric III (the last Merovingian king) to the monastery of St. Bertin, where he is said to have died in 755. Childeric's son Theuderic was raised inside a monastery, which in all likelihood means he never had children.
Source: "The Carolingians: A Family Who Forged Europe", Pierre Riche, trans. Michael Idomir Allen. 1993. pg 67-68