"Blend of Jai and Lynn"
The name Jailynn is commonly a female name from the "American" origin.
Jailynn is a modern American formation built from the name elements Jai and Lynn, following the same pattern as Jaylynn and Jaelynn. Lynn is a long-established English name element, while the opening syllable uses the J-plus-ai spelling that became common in American names from the 1990s onward. The name first appears in US birth records in 1993, which fits a late twentieth-century formation rather than an older traditional name.
The pronunciation of Jailynn is JAY-lin.