"Blend of Karl and Lynn"
The name Karlynn is commonly a female name from the "American" origin.
Karlynn is a modern American formation built from Karl, the German form of Charles, and the -lynn element found in names such as Carolyn and Marilyn. The initial K matches the German Karl rather than the English Carl. It first appears in United States birth records in 1948.
The pronunciation of Karlynn is KAR-lin.