It disturbs me slightly to see apostrophes missing from names such as O'Connor, or names like McLaren typed as Mclaren. Also double barrelled names where one name (usually the last one) doesn't have a capital letter.
It always used to be a faff to change your name on FB (not sure about how it works now). My brother put in a typo when he was creating his account and it took ages for him to work out how to fix it and get it changed.
O[space]Something is a perfectly valid Irish surname form. Dara O Briain, for example, is definitely Dara O Briain and not Dara O'Briain. It being his actual name I'm not sure that the fact that it disturbs you slightly will be featuring heavily on his radar.