Incidentally, muslim names are not pronounced the same way everywhere. Many of the names muslims use in
India, for example, are either of Arabic or Persian origin, but they are often pronounced according to the phonotactics of the local language. In some parts of
India, this "Muslim" name is used on formal occasions, but people also have a familiar name which often is indistinguishable from the familiar names of people of other communities. This latter statement is often true of Christians as well.
Even when the commonly heard pronunciation differs from the original Arabic or Farsi one, the latter is considered the "correct" one, especially for traditional (e.g., quranic) names.