Combination of Jasmine and Lynn
Jaselyn is a modern American invention, likely created by blending the floral name Jasmine with the popular suffix -lyn. It combines the botanical associations of the jasmine flower with the Welsh-derived 'lyn', meaning lake. As a contemporary coinage, it does not have a singular ancient etymology but follows the 21st-century trend of rhythmic, multi-syllabic feminine names.
Less common today
Jaselyn isn't in the latest US Top 1000. It last peaked at #5,560 in 2013.
US births per 5-year period, 1990βpresent (SSA data).