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Unknown. That way you can wait till xe can tell you xe's name when xe is ready. Familiarize yourself with name change paperwork as xe may change its name and identity a lot as it discovers it. you may have to add a number after Unknown as to distinguish your unknown from the other unknown clumps of cells in your life.
If it is wrong to assign a gender to a baby and you must instead wait and see what the baby identifies as, then it is also wrong to assign a name to a baby. You are taking away that baby's right to self-identification the same way you do for gender.
For that matter, don't teach the baby English. Allow the baby to grow and decide which language(s) they would like to speak, even if that's no identifiable language at all - which is a valid choice.