Follower of Christ
Krystyne is a modern phonetic spelling variant of Christine. It ultimately derives from the Latin name Christina, which was used to denote a follower of the Christian faith.
Less common today
Krystyne isn't in the latest US Top 1000. It last peaked at #5,820 in 1990.
US births per 5-year period, 1990βpresent (SSA data).