Another problem is who knows the surname of your twenty seven times Great Grandmother though the female line only. I don’t have a clue what countries all of my 27th generations back ancestors lived in. On the other hand going back 160 generations I’m probably related to my namesake, if only through my Jewish ancestors (my Finnish ancestors, not so much). My Irish ancestors are a possibility, especially from the Anglo-Norman-Irish side (de Burge - Burke).
Dad’s side has been traced back to the Cruickshank name,,,
Victoria Cross back up the line,,,(WWI),,,
The name goes way back to Scotland,,,
Interesting stuff...;0)