Kristina, I totally disagree although I can only speak for myself obviously. For me having my surname changed when adopted, and a new birth certificate issued, affected me because it was to do with changing my identity. As a child it made me feel like a non person who was being transferred as chattel, as though I wasn't real, I was just an object being controlled by people around me, and although as an adult in the greater scheme of things I can let it go, if I was able to change back to my birth details through the courts easily and without evidence or hassle then I would.
I can only speak for myself, as I say, but having said that, I have read a post on here where an adoptee was saying that they wanted to annul the adoption and change their birth certificate back.
It is partly to do with how successful the adoption relationship is, but not entirely. I don't have much angst about my childhood, but would still feel as above.
If my first name had been changed I would feel a sense of outrage. It is not be about the fact that my bio mother had given a name, or about her rights, more about the fact that I had been given a name already and it had been changed without discussion with me, and as a child I would not have been able to join in the discussion with full understanding because I was a child, and as an adult I could choose to change my own name.
The exception to the above is if there are very good reasons, to do with security or other, and a court and other professionals had endorsed the decision. Not simply because my adoptive parents wanted to do it.
I think it is important for the children that you follow due process, and comply with the rules of the SWs and the system and the court which entrusted you with a child, because that is the right thing to do. To ignore due process is arguably an abuse of your position. Sorry.
To me the comment by italian about birth mothers not being able to care for the child and therefore why should they get to choose the name completely misses the point, and to me isn't very appropriate on a forum for the whole triangle.
If memory serves one of the adopters changed the name of a 2.5 year old and I find that a bit worrying as at that age my dc were most definitely cognisant of their names (!) but I might have misunderstood that or it may have been for good reasons.