"Blend of Brent and Lee"
The name Brentlee is commonly a unisex name from the "American" origin.
Brentlee is a modern American name formed from Brent plus the ending -lee, as in the name Lee. Brent is used as a given name from an English surname, and the same -lee ending appears in other American names coined in the late twentieth century. It first appears in United States birth records in 1990.
The pronunciation of Brentlee is BRENT-lee.