"Blend of Hazel and Lynn"
The name Hazelyn is commonly a female name from the "English" origin.
Hazelyn is a modern American formation that joins the established English name Hazel, which refers to the hazel tree, with the common name ending -lyn. It first appears in United States birth records in 2005, which fits a name assembled from familiar parts rather than one inherited from an older naming tradition.
The pronunciation of Hazelyn is HAY-zuh-lin.