Slender or fair
Calyn is a modern American coinage, likely derived as a variant of the Irish name Caelan or a combination of the prefix Cal- with the popular suffix -lyn. In its Irish roots, it relates to the word 'caol' meaning slender. It is often chosen by parents seeking a unique alternative to names like Kaylin or Callie.
Less common today
Calyn isn't in the latest US Top 1000. It last peaked at #3,431 in 1997.
US births per 5-year period, 1990βpresent (SSA data).