I too looked into changing my last name back to my original, sometimes thinking about a heritage legacy thing
My father was adopted by a man who’s heritage is quite different than his own. I know my fathers, fathers last name. It is the name of a county in Ireland. While I had never seriously considered changing my own last name, I will more than likely use the Irish county name as a middle name for a child if ever I am blessed with one.
I sure agree with you though - your real father, the man who raised you would be terribly hurt if you changed your name. It would be such an insult.
Actually my real father gave me, my last name and heritage to my Dad. I have no serious relationship with my real father, who has always lived within 45 minutes of me, my brother and sister. There is no animus. We are very different persons and my self view is at variance with his description of me. The friction is not worth the time.
My Dad, who adopted me, lives 1600 miles from me and since his divorce from my mother he has been a constant guide and father one aspires to emulate. Our relationship is very close and he always been generous with his love.
It is my Dad who has been there all my life whose feelings I would not hurt(you would call him Stepfather but, we don’t think that way. He is Dad, period.)