Lév is the handle Dreis uses outside of Emisre, as his society frowns upon using one's given name until one has returned to their birthplace to marry or claim inheritance. During S's intervention against the Determinants of Baronesia in “Stars of Suocé” (TBA) , Dreis uses this handle to come to the country and figure out if “S” is the Trainer he suspects her to be, to thus give local Suocé trainers proper warning to stay out of her way.
Whether there are other Trainers using the handle, or if an actual Lév exists, Dreis does not know or care.