In my experience very few anglophones can pronounce non-English names correctly -my clan has more or less given up, so that even Hugh Dan on BBC Alba is mispronouncing MacCoinneach in Gaelic. America seems to be worse than England in this respect, especially with Polish names, where 'ow' is consistently pronounced as in cow rather than as of. Some familes have given up and changed their spelling, eg Mingus (Menzies) or Powlus (Paulus).