[Ola]

Ebrahim in Persian
Ibrahim in Arabic 
Abraham in Hebrew

As per Quran, Abraham was not a Christian.

Quran 3:67 “Abraham was neither a Jew nor a Christian, but he was one inclining toward truth, a Muslim [submitting to Allāh]. And he was not of the polytheists”

Quran 3:65 “O People of the Book! Why do you argue about Abraham, while the Torah and the Gospel were not revealed until long after him? Do you not understand?”

Oh I see.

I checked, so he is the Father of Many Nations

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Oh I see. 

According to the Bible, reflecting the change of his name to "Abraham" meaning "a father of many nations" for zillions of Believers of God.