"Blend of Hae and Lynn"
The name Haelynn is commonly a female name from the "English" origin.
Haelynn is a modern American formation, first recorded in United States birth records in 2011. It joins the opening syllable of Hailey with the -lynn element that appears in a large group of American girls' names created from the 1990s onward. No earlier use of the name in another language, and no meaning attached to it there, is documented.
The pronunciation of Haelynn is HAY-lin.