Also, mispronunciation of foreign names is an interesting political weapon. Churchill - who I'm sure knew the correct pronunciation - chose to say /'næzi:/ for NAZI. And more recently, Thatcher used her abuse of Galtieri's name as a weapon of war (/gælti:eəri:/ she used to say, with 4 - nearly 5 - syllables) .
And another thing - names get Anglicized for political reasons: just before the First War, German Street in London became what it is today - 'Jermyn Street'; careful RP-speakers still use a schwa for the final vowel; and Lord Mountbatten's family name was originally Battenberg (which may have been changed either because of the war or because of the cake - which makes it sound faintly ridiculous). But I'm beginning to ramble; I could witter on for ages about family names!