A follower of Christ
Keerstin is a rare phonetic spelling variant of Kirsten, which is the Scandinavian form of Christina. It ultimately derives from the Latin name Christianus, meaning 'follower of Christ'. While the spelling is modern and unique, it retains deep historical roots in Northern European naming traditions.
Less common today
Keerstin isn't in the latest US Top 1000. It last peaked at #9,441 in 1993.
US births per 5-year period, 1990βpresent (SSA data).