Is It Possible That the Intruder Did Not Know the Little Girl's Name?

Patsy is not named. Jambinee is not named, but is referenced as your daughter or she. Is it possible that they avoided that name because they didn't know how to spell it? Also, could the intruder have only known John Ramsey's name? But again, maybe there's all these little tells that if it's an intruder, that they know the family well.