Valley of the River Kent with a suffix
A modern American invention combining the traditional English surname Kendall with the popular feminine suffix -lyn. Kendall originally referred to the Kent Valley in England, while the addition of -lyn softens the name for a feminine contemporary feel.
Less common today
Kendallyn isn't in the latest US Top 1000. It last peaked at #6,362 in 2014.
US births per 5-year period, 1990βpresent (SSA data).