Allie comes from her real name Alexandra. The 'X' has more history.
In mathematics, X is any possible variable. It is an unknown quantity. Once it is solved, it ceases to be X. She recounts: ‘X is the identity that I take on as I go through my journey of self-discovery. It's these questions that I'm trying to grapple with in the public sphere. If I ever find that piece that I'm after or solve the equation, as it were, then I will no longer be Allie X’.