Slender, fair, or graceful lake
Kielynn is a modern American invention, likely created by blending the Irish-derived name Kiera or Keely with the popular suffix -lynn. It combines the Gaelic roots for 'slender' or 'graceful' with the English association of a lake or pool.
Less common today
Kielynn isn't in the latest US Top 1000. It last peaked at #10,914 in 2013.
US births per 5-year period, 1990βpresent (SSA data).