Apparently (and I have no recollection) I created my account under my then-username "Amatulic" in 2015, and then I was renamed to "Anachronist" in 2016, which renamed me in the other Wikimedia projects except this one. Recently when I logged in as "Anachronist" my account appeared as "Amatulic". I was going to ask that it be changed but it looks like that got done.