There are two or three novels (more like junior high/high school novels - called YA today) in a series. All about Akhenaten and his decision to worship the one god, Aten. He and Nefertiti had several daughters, one named Merriaten? Tutankhamen, who began life as Tutankhaten, was also in the later novels. Very romanticized. No plural marriage mentioned.
Stump the Bookseller
New format, same book stumper solving.
There are many possibilities, of course. Akhenaten and Nefertiti had several daughters, the oldest Merit-aten, the second Meket-aten (died very young), the third Ankes-pa-aten, later Ankhes-amen, wife of Tutankhamen, the fourth Neferneferuaten Tasherit:, the fifth Neferneferure and the sixth Setepenre.
Depends on when you read them, because there have been novels ever since 1923, and all of them likely to fit your description, but you might check out Sally Watson’s THE IVORY CAT, THE MISSING QUEEN, and THE NEXT PHARAOH.
This might be “The Lost Queen of Egypt” by Lucile Morrison, published in 1937.