"Blend of Quinn and ley"
The name Quinnley is commonly a female name from the "American" origin.
Quinnley is a modern American formation built from the established given name Quinn plus the -ley ending, the same ending that appears in other American girls' names coined in the same period, such as Paisley and Brynlee. It has no earlier recorded history in English, Irish or any other naming tradition, and its first appearance in United States birth records is 2010. The name carries no inherited meaning beyond the elements it is put together from.
The pronunciation of Quinnley is KWIN-lee.