User blog comment:LegerPrime/Heartfilia Family/@comment-4449950-20160402235942

She's Layla's ancestor, and the answer to why she has Heartfilia as her last name is "because Hiro Mashima" .-.

(But lol it was soooo funny seeing fans rage at people who called her Anna Heartfilia. I legit saw comments on other sites like "Omg, this fandom is full of fucking retards. Anna cannot be a Heartfilia! That is Jude's last name! So why is everyone calling her Anna Heartfilia? I can't believe people are so fucking stupid!" Cue next chapter where she's revealed to be Anna Heartfilia and I'm dying of laughter XD)