All of this sort of thing is not unusual. The English have Rome, the locals Roma, for example; and then there's Munich – München; Lisbon – Lisboa; Vienna – Wien; and so on. The French talk about Londres and Edimbourg and Douvres and Vienne instead of London and Edinburgh and Dover and Vienna. And there are countless other examples. I suppose the problems arise when there is a political connotation in one name or the other (Londonderry – Derry; Falklands – Malvinas) or a bad history: but I like the approach descibed by olekorlo and his/her attitude.