"Blend of Jamie and Lynn"
The name Jamielyn is commonly a female name from the "American" origin.
Jamielyn is a modern American feminine compound of Jamie and Lynn, two names that are also used on their own. Jamie is an English diminutive of James, and Lynn is a common second element in American girls' names, taken from a Welsh word for a lake and also from an English surname. The name first appears in United States birth records in 1976, which fits the pattern of a twentieth century compound rather than an inherited traditional name.
The pronunciation of Jamielyn is JAY-mee-lin.