Son of Ann or son of Hans
Ansen is a patronymic surname-turned-given name. It likely originated as a variant of Anson or Hansen, meaning 'son of Ann' or 'son of Hans'. In some contexts, it is viewed as a Germanic derivative related to the name Anselm.
Less common today
Ansen isn't in the latest US Top 1000. It last peaked at #5,583 in 2014.
US births per 5-year period, 1990βpresent (SSA data).