Brennley is a distinctive girls' name in United States, ranking #17339 in 2012 with 5 recorded births. This places Brennley in the bottom 11% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 56 births ranking #2930. In 2012, approximately 1 in every 352,148 girls born was named Brennley. FALLING Recent data shows the name is currently falling.