Piri Reis was a Muslim NOT a Christian or a Jew   His name easily proves hes 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 SAWPeace 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