Board Thread:General Discussion/@comment-36851750-20181207175917/@comment-3218221-20181207194750

^^Yes to the above, even if the previous username was yours to begin with.

If you want FANDOM's stance straight from the horse's mouth, read their Help:Changing your username page. (Are you on desktop? If so, this link is actually also accessible in the top navigation's help menu. Help > Help Pages > top link shown.)