Follower of Christ
Krystan is a modern phonetic variant of Kristen or Kristin. It ultimately derives from the Latin name Christianus, which refers to a follower of the Christian faith.
Less common today
Krystan isn't in the latest US Top 1000. It last peaked at #3,623 in 1991.
US births per 5-year period, 1990βpresent (SSA data).