A follower of Christ
Kierstan is a modern American spelling variant of Kirsten, which is the Scandinavian form of Christina. It ultimately derives from the Latin name Christianus, referring to a believer in Christ. While less common than its counterparts, it retains a strong connection to its religious roots.
Less common today
Kierstan isn't in the latest US Top 1000. It last peaked at #3,802 in 1998.
US births per 5-year period, 1990βpresent (SSA data).