Follower of Christ
Curstin is a modern phonetic variant of Kirsten, which is the Scandinavian form of Christina. It ultimately derives from the Latin name Christianus, meaning a follower of the Christian faith. While rare, it follows the mid-century trend of adapting traditional European names with unique American spellings.
Less common today
Curstin isn't in the latest US Top 1000. It last peaked at #7,088 in 1996.
US births per 5-year period, 1990βpresent (SSA data).