Wikipedia
In Latter-day Saint theology (also known as Mormon theology), Egyptus is the name of two women in the Book of Abraham in the Pearl of Great Price. One is the wife of Ham, son of Noah, who bears his children. The other is their daughter, who discovered Egypt while "it was under water" (1:23). The younger Egyptus places her eldest son on the throne as Pharaoh, the first king of Egypt (1:25).
The word Egyptus is considered to be an anachronism in the Book of Abraham among non-Mormon Egyptologists and historians, since the origin of term "Egypt" is believed to have come from another source much later in history from the time of the narrative described in the Book of Abraham. The word "pharaoh" is also considered to be an anachronism in the Book of Abraham for similar reasons.