Mckennah is a distinctive girls' name in United States, ranking #7357 in 2012 with 17 recorded births. This places Mckennah in the top 38% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 31 births ranking #3856. In 2012, approximately 1 in every 103,573 girls born was named Mckennah. FALLING Recent data shows the name is currently falling.