So when someone chooses wether to not change their name get married or to change their name, it's without doubt bloody rude to not observe their choice and call them by the name they have not chosen for themselves, and I've never heard anyone disagree with that.
So why is it ok to call Osborne by the name he's been given at birth rather the one he chose for himself?
Does the etiquette only apply to surnames?
(btw - no big fan of him, just wondering in general)