` Piri Reis was a Muslim, NOT a Christian or a Jew ==  His name easily proves he's a Muslim.  ``Hadji`` refers to a person who has performed the Hajj pilgrimage.  Ahmed, which is one of the names of the holy Prophet Muhammad (SAW/Peace be upon him).  Muhiddin being a common Muslim name (with particular emphasis on the ``iddin`` or ``uddin`` which is used by Muslims exclusively. Many famous Muslims have ``Iddin`` or ``Uddin`` in their name, such as Jalaluddin Rumi (the poet) and Salahuddin Ayyubi (the name who defeated the Crusaders) and many, many more.   ==`