"Kek (Kuk, Keku) means darkness. He was the god of the darkness of Chaos, the darkness before Time began. He was the god of obscurity, hidden in the darkness. The Egyptians saw the night-time, the time without the light of the sun, as a reflection of this chaotic darkness.
"The characteristics of the third paid of gods, Keku and Kauket, are easier to determine, and it is tolerably certain that these deities represent the male and female powers of the darkness which was supposed to cover over the primeval abyss of water; they have been compared by Dr. Brugsch with the Erebos of the Greeks."
-- The Gods of the Egyptians, E. A. Wallis Budge
"As a god of the night, Kek was also related to the day - he was called the "bringer-in of the light". This seems to mean that he was responsible for the time of night that came just before sunrise. The god of the hours before day dawned over the land of Egypt. This was the twilight which gave birth to the sun."