It is worth noting that the Encyclopedia of Islam has no entry entitled Hajar or Hagar. She was the mother of the biblical Ishmael, Abraham’s first-born son. If you look up the entry on Ishmael, you find one cryptic sentence towards the end of...

Hagar (Hebrew הָגָר "Stranger", Standard Hebrew Hagar, Tiberian Hebrew Hāḡār; Arabic هاجر; Hagar), according to the Abrahamic faiths, was an Egyptian handmaiden of Sarah, wife of Abraham. Her story is reported in the Book of Genesis in...