A page from Champollion’s notes

1) In the first name, written , the first sign is a circle which resembles a drawing of the sun. The word for ‘sun’ in Coptic, an ancient Egyptian language spoken in the Greek and Roman period and still used by the Christian Coptic Church today, is re.

2) In the second name, written , the first sign resembles an ibis. This bird is known to have been identified with the ancient Egyptian god Thoth.

3) On the Rosetta stone, the hieroglyph  is used in the Egyptian for the Greek word "birthday celebration." Perhaps the sign has something to do with the idea of being born or giving birth. In Coptic, the word "to give birth" is misi, and the word for "born (of)" is mose.