Follower of Christ or anointed one
A modern elaboration of Christina or Christiana, ultimately derived from the Greek name Christos. It signifies a person who follows the teachings of Christ or is 'anointed'. The 'y' spelling adds a contemporary, decorative flair to the traditional Latinate root.
Less common today
Christyana isn't in the latest US Top 1000. It last peaked at #7,037 in 2006.
US births per 5-year period, 1990βpresent (SSA data).