Manetho
By the Middle Kingdom, Egyptian kings each had five different names. These were the "Horus" name; the "Two Ladies" name; the "Gold Horus" name; the praenomen or "throne name"; and a nomen, the personal name given at birth (also called a "Son of Ra" name as it was preceded by Sa Re'). Some Pharaohs also had more than one of these names. For example, Ramesses II used six Horus names at various times.  We do not know if Manetho knew about the different names of rulers long past. Not all the different names for each king have been discovered, and it maybe that the kings were known by other names as well as the official names. Because Manetho translated the names into Greek, we do not know the original Egyptian name.