Follower of Christ or church-dweller
Keirston is a modern American variant of Kirsten or Kiersten, which are Scandinavian forms of Christina. It ultimately derives from the Greek name Christos, meaning 'anointed'. While rare, it follows the trend of using 'K' and 'ton' suffixes to create unique phonetic variations of traditional names.
Less common today
Keirston isn't in the latest US Top 1000. It last peaked at #6,489 in 1991.
US births per 5-year period, 1990βpresent (SSA data).