You can say that youare descended froma particular ancestor or group of ancestors.
I'm descended from a French-Canadian merchant.
He didn't know he was descended from Argentinians.
You can also say that youtraceyour ancestry or origins back to a particular person, place, or time, or that your familygoes back toa particular time or place.
I can trace my ancestry back to the Victorian era.
We traced our origins back to Ireland.
Our family name goes back to the time of William the Conqueror.
One branch of his family goes back to the 1600s.