For each of your DNA Matches, we automatically identify which surnames you have in common with each matched person. An ancestral surname that you and your match share could point to the identity of the shared ancestor from which both of you inherited the same DNA segments.
You can see the ancestral surnames on the right hand side of each DNA Match, like in the examples below:
Move the mouse over the common ancestral surnames to get a tooltip with additional details. You will see how many ancestors of the matching individual and tree owner’s share the common surname, and the shortest relationship path between each one of them and an ancestor with that surname: