WikiTree's policy on naming is to use their convention not ours, and although that is difficult for pre-1700 profiles and doubly difficult for pre-1500 it shouldn't be a reason to abandon the naming policy without some attempt to find the most appropriate name for that time
I note that currently there are no sources on the profile for William or his wife, parent, grandparents etc. and that there is a merge that is over due but maybe a source or sources should be found first. I'll see what I can find.