What is the full name of Assassin's Creed protagonist Altaïr?

The full name of Assassin's Creed protagonist Altaïr is Altaïr Ibn-La'Ahad.

Altaïr is the central historical character in the first Assassin's Creed game. He is an Assassin operating in the Levant during the Third Crusade, with major sequences taking place in Masyaf, Jerusalem, Acre, and Damascus. His name is commonly rendered with a diacritic as Altaïr, although simplified spellings also appear.

The Arabic phrase Ibn-La'Ahad is generally translated as “son of no one.” The character's story follows his fall from rank after a failed mission, followed by a gradual restoration of his status as he investigates targets and uncovers a larger conspiracy.

Altaïr is sometimes confused with Ezio Auditore, the Italian Assassin who leads Assassin's Creed II and its sequels. The two characters belong to different historical periods, but their stories are connected through the Assassin Brotherhood and the series' framing narrative.