I once found this book called Genealogy of the Kings of France. Both previous answers are more or less correct. The Merovingian dynasty did begin with Merovee, the son of the Frankish chief Clodion, who was succeeded by his son Childeric I, the last of the pagan rulers. There were 18 more kings in the Merovingian dynasty, the last of whom was Charles Martel, mayor of Childeric III's palace, and hence not a blood descendant of the royal Merovingian dynasty. Succeeding him was his son Pepin the Short, who was Charlemagne's father. In the book, it lists only one wife of Charlemagne, Hildegarde, and doesn't mention any royal lineage for her. Therefore the answer to your question is no.