Well, no, the Ottoman dynasty began with Osman I. His family goes back further and I'm pretty sure they were beys long before him but the Ottomans specifically trace descent back to him. His father founded Sogut, and the earliest ancestor I can find is two generations previous to that.
I merely meant that the family Osman was from existed before him. Aren't the Robertians and Capetians the same dynasty, just with different names? Or the Liudolfings and the Ottonians?