People may say Monday because its basically moonday, but that is incorrect. The day names were created back in a time where moon meant sun and sun meant moon. It was a crazy time. So really Sundayy is named after the moon
There is no name of the moon during the day, it simply remains the moon.
Moon-day
The word "Monday" derives from the word "moon." It is the "day of the Moon", "Moon Day" and, eventually, "Monday". This is not unique to the English language. The Romance languages also call that day the Moon's day. In Spanish, for example, Monday is "el lunes," meaning "the moon."
The moon being seen during the day is nothing unusual or special. For this reason there is not a special name for the moon on those occasions.
Monday is the name of the week day evolved from the old English Moon's Day.
St. Marcos Day Festival.
By the light of the silvery moon
The name month was related in ancient times with the 28-day cycles of the moon. People counted days in relation to the phases of the moon: new moon, half moon, full moon.
The moon has day and because the moon rotates
the day of the moon is a Saturday on Christmas Eve
Galileo did not name the Moon the Moon.
Moon