"Blend of Katie and Lynn"
The name Katielynn is commonly a female name from the "American" origin.
Katielynn is a modern American blend of the name Katie and the name element Lynn. Katie is an English diminutive of Katherine, and Lynn is a common second element in American compound names for girls. The joined spelling first appears in United States birth records in 1980.
The pronunciation of Katielynn is KAY-tee-lin.