In my view these kinds of things have to occur by consensus or not at all There s just no numerical way to determine most common and while my mere impression is that ancient historians and classicists of the last 30 years do not call him Julian the Apostate as if that s his name and that this is a holdover from more Christian centric days you can t prove it and it s a waste of everybody s time to attempt to do so Numerically you ll get a lot of hits because even if a scholar doesn t call him Julian the Apostate the tradition of that name must be explained in any extended treatment of Julian My chief argument against Julian the Apostate as most common is that apostate itself is an uncommon word if you grab 50 people at your local mall and ask them if they ve heard of either Julian the Apostate or the Emperor Julian you ll probably get a stronger glint of recognition with the Emperor phrase simply because most people know what a Roman emperor is and not what an apostate is As far as I know Julian is the only emperor who s identified with a title not part of his official nomenclature Since Julian the Apostate would of course redirect here I don t see the value of WP promulgating a tendentious nickname instead of following our usual naming policy as outlined in WP ROMANS There are however people who feel very strongly that we should perpetuate the Apostate for reasons that are unclear to me but valid to them