don't know what if any difference this made to the makers of The Mummy, but there was
really an ancient Egyptian woman named Anck-su-Namun...sort of.
Two of my sources give her name as Ankhesenamun and Ankhesnamum. She was, ironically enough, the daughter of Queen Nefertiti! o_0
At age 14, she married King Tutankhamun (Tut to his friends ;-)
Ank. and Tut. did not have any surviving children. The mummies of two infant girls were found in the same tomb as Tutankhamun, and some believe they were their children, possibly stillborn.
After Tut's death, Ankhesnamun was engaged to a Hittite prince, but he was assassinated during the journey to Egypt. She instead married a man named Ay. Ay had presided over Tut's funeral rites, which gave him a tenuous claim to the throne, and by marrying the young pharaoh's widow he cemented that claim. Thus Ay became the next pharaoh of Egypt.
There is some inconclusive evidence that Tut died from a blow to the head. It's tempting to read an ancient murder plot into this, even perhaps one involving Ay himself, but of course such thoughts are all speculation. Still, it's an intriguing possibility that perhaps the historic Ankhesnamun had some of the same troubles as her cinematic counterpart...
Novelist and Egyptologist Christan Jacq says in his Ramses series that Ankhesenamon (yet another spelling) was one of the heretic pharaoh Akhenaton's six daughters. Jacq says she was later executed for her dealings with the Hittites, even though her goal was the protection of Egypt's throne. Akhenaton was an unpopular pharaoh at the time because he urged his people to give up their polytheistic beliefs in favor of worshipping only the god Aton.