"Blend of Breck and Lynn"
The name Brecklynn is commonly a female name from the "American" origin.
Brecklynn is a modern American blend of the stem Breck, which also appears in given names such as Brecken and Breckin, and the element Lynn, a frequent ending in American girl names. Its first appearance in United States birth records in 2005 fits that pattern rather than an inherited name from an older naming tradition. Because it was formed from these two elements, it has no older root meaning beyond the two parts.
The pronunciation of Brecklynn is BREK-lin.