Origin & History of “Monday”
Etymologically, Monday is the ‘moon’s day’. It comes from a prehistoric German translation of Latin lūnae diēs ‘day of the moon’, which also produced German montag, Dutch maandag, Swedish måandag, and Danish mandag. In the romance languages, the Latin term has become French lundi, Italian lunedì, Spanish lunes, and Romanian luni. (The various words for ‘Monday’ in the Slavic languages, incidentally, such as Russian ponedel’nik, mean basically ‘after Sunday’.).