I have a similar issue. My dad was adopted by his stepfather. His LNAB was Fischer, which mine should be. But since his stepfather adopted him and my father never changed it back to his birth name, I have "Blevins" as my LNAB, which I have *no* blood connection to the name. WikiTree presents me with ways to research Blevins but I'm not interested in that name, especially since that stepfather was abusive and he died before I was born. I have put in (tagged) the other surnames I'm interested in, but WT does still suggest how I can find more about "Blevins." I find it annoying but just try to ignore it.