A little bit of the backstory.
My dad's dad (my granddad. I will call him Ben) stopped talking to my mum after my dad died when I was 6 years old. Although, Ben would send the occasional card I had no other contact with him until I was 18 years old. We occasionally send messages to each other, but otherwise, we don't have a relationship.
I have no memories of my dad.
My dad's mum (my nan) had remarried several years later to 'John'. My mum didn't have a relationship with my nan, so I only met her a handful of times before she died. I have very little memories of John, but from what I remember of him, John was a gentle person and was pleasant to be around. John passed around when I was about 8 years old. My nan died about 2 years later.
I obviously have my dad's surname, which is Ben's surname. I don't have a relationship with other family members and the only thing that connects us is our surname.
Since we're expecting a baby, I have thought of my child's name and it was decided the baby should have John's surname as he was the only decent family member in my life. Even if I don't have many memories of him.
I was talking to a friend about my pregnancy and the topic of the surname came up. She assumed I would give the baby my surname and when I said I was going to be giving them John's surname instead she started making comments about how she would just stick with my surname as John wasn't 'family'. I explained that although John wasn't related by blood, he was the best member of my family. John never had children (before he married my nan and no shared children between the two of them). She said it would be unfair for Ben if my child had John's surname. Keep in mind, my grandad does have other grandchildren who have children with his surname, so it's not like I'm his only grandchild to pass on the family name.
I don't know how Ben felt about John as he never spoke about him. I do know that after Ben and my nan broke up their relationship was not great and from what heard it was toxic.
I guess I'm just wondering how it sounds to other people if my child had my step grandad's surname. I have thought about changing my surname as cut any ties to the others.