I want to entertain all possibilities in all of my answers to questions, though you are rarely going to come across an instance where you are needing to tune up to play in drop D tuning. The names of tunings are invoked by first considering the base point of tuning. This is more often than not the standard tuning of E - A - D - G - B - E. From here, the alternate tuning is figured, hence why drop D is called drop D in the first place, because the lowest pitch, E, is dropping in pitch to D. And so it goes for double drop D tuning, where both of the E pitches that would be present in standard tuning on the alternate poles of a set of strings are being dropped by a tone to D.