While your first point is absolutely right, the problem that this arise, is that they rumours mention the japanese one, so if someone could ensure what does the mother (and or other characters) call him, that would probably clear it up.
I never stopped to think about it. Honestly I don't care much about this, it doesn't change anything for me either way.
Ruto pics were made with other graphics in another game... LA, LttP Zora for example are not nearly as pretty. So it doesn't prove much for me that she had "small bumps" or...