Combination of Shy and the suffix -lyn
Shylyn is a modern American invention, likely created by blending the word or nickname 'Shy' with the popular feminine suffix '-lyn'. It may also be a creative phonetic spelling of Shailene or a variant of the name Shaylyn. Because it is a contemporary coinage, it lacks a deep etymological history but follows the 21st-century trend of 'lyn' ending names.
Less common today
Shylyn isn't in the latest US Top 1000. It last peaked at #12,162 in 2008.
US births per 5-year period, 1990βpresent (SSA data).