Until the late 1980s, the term Moslem was commonly used. Muslims do not recommend this spelling because it is often pronounced "mawzlem" /m?zl?m/ which sounds somewhat similar to an Arabic word for "oppressed" (Za'lem in Arabic)....Many English-language writers used to call Muslims Mohammedans or Mahometans. ...
English writers of the 19th century and earlier sometimes used the words Mussulman, Musselman, or Mussulmaun. Variant forms of this word are still used by many Indo-European languages. These words are similar to the French, Spanish, Italian and Portuguese words for "Muslim."
Look for those old names to make a new comeback. As the saying goes, what is old is new again because non-moslems are simply are getting fed up bigtime.