From Egyptian
ḏd-f-rꜥ meaning
"his stability is Ra", from
ḏd "stability" combined with the name of the god
Ra. This was the name of a pharaoh of the 4th dynasty of the Old Kingdom (26th century BC), a son of
Khufu. His name was also written with the hieroglyphs in reverse order, as
Radjedef.
