Son of Brand or son of the raven
Bransen is a patronymic surname-turned-given-name. It most likely derives from the Old Norse name Brandr, meaning 'sword' or 'fire', or the Celtic element bran, meaning 'raven'. As a modern American coinage, it often functions as a stylistic variation of Branson.
Less common today
Bransen isn't in the latest US Top 1000. It last peaked at #2,259 in 2017.
US births per 5-year period, 1990βpresent (SSA data).