Thats news! Muslims rarely use Anglicised or European or Roman names. Of course, they do have Jewish names like Joseph and Abraham in the Islamic form of Youseph and Ibrahim.
Is this what you mean by "American" names? Most Muslims who follow Islam don't use any name other than those from the Koran.
Indeed it is news.
Seems for a few years now the Nation of Islam was all the rage and converts did indeed change their names.
However, converts do not always join the NOI, and are not always changing their names.
Not true Turkish Muslims have names like Cem (pronounced Jem) and they have more latinized names. Kemal Pasha made sure of that.