Unknown; likely a modern invented name or variant.
Kyen is a contemporary name with no established etymological history. It is likely a creative variation of names like Ryan, Kai, or Kian, or a phonetic invention following the popular 'K' and 'en' sound trends in American naming.
Less common today
Kyen isn't in the latest US Top 1000. It last peaked at #5,776 in 2006.
US births per 5-year period, 1990βpresent (SSA data).