"Blend of Brae and Lynn"
The name Braelynn is commonly a female name from the "American" origin.
Braelynn is a modern American formation that pairs the element Brae, also written Bray, with the suffix -lynn. The -lynn ending recurs in American names such as Kaylynn and Raelynn, where it acts as a name element in its own right rather than as a diminutive. The name first appears in US birth records in 1989, which fits that pattern rather than any older documented use.
The pronunciation of Braelynn is BRAY-lin.