My father, grandfr, and grt grandfather were McNamaras. I did the straight paternal line DNA test on my McN brother and his top matches were all named Savage! A name that has never as far as I know been associated with our family. Someone at the DNA place told me the most likely scenario was that a female Savage married a McNamara and took in sibling(s) due to war, famine, death, and that the child assumed the McNamara name. There is only one McNamara result in all of the DNA matches, and that person doesn't have any Savage connection as far as I know.
Hoping someone will have some insight into this. and have a connection.