"Blend of Brie and Lynn"
The name Brielynn is commonly a female name from the "American" origin.
Brielynn is a modern American formation that reads as the given name Brie followed by the -lynn ending, a pattern also seen in American names such as Kaylynn and Raelynn. Brie is separately used as a girl's name in the United States. The name first appears in US birth records in 2005, which fits a recent coinage rather than an inherited name from an older naming tradition.
The pronunciation of Brielynn is BREE-lin.