With most proper nouns, the original meaning is associated more with the derivation. If you meet a woman called 'Faith', is religion the first thing that leaps into your mind? There are cases (North/South) where a case can be made out for antonyms, but with people and place names, I think it would be strained and artificial to do so- a proper noun denotes the person/thing etc more than the etymology.
Is atheism or really the antonym of someone called Faith? And what's the antonym of London? New York contrasts with York, but that's not an antonym, or even much of a association to many- when I hear the words, I never think of York.