Definition
A traveler.
Origins
From Hebrew בֶּן־שָׁחַר (Ben-Shahar, “son of dawn”), an allusion to the practice in the Middle East of travelers rising before dawn so they would not have to travel in the heat of day.
How People Actually Use It
one of the many names of the fallen angel, satan(aka lucifer). many musicians have used this phrase such as Misfits in Speak of the Devil "Some call me the sone of the morning, god knows im the angel of light" and Danzig "Son of the Morning Star
""Some call me the Son of the Morning, God knows im the Angel of Light"
Source: Urban Dictionary