A follower of Christ
Kyrstin is a modern phonetic variant of Kirsten, which is the Scandinavian form of Christina. It ultimately derives from the Latin name Christianus, meaning 'a Christian' or 'follower of Christ'.
Less common today
Kyrstin isn't in the latest US Top 1000. It last peaked at #2,108 in 1991.
US births per 5-year period, 1990βpresent (SSA data).
United States Senator from Arizona