Mckennah is a distinctive girls' name in United States, ranking #6170 in 2015 with 21 recorded births. The name reached its all-time peak in 1999 with 31 births ranking #3856. Since 1996, the popularity has increased by 16.7%. In 2015, approximately 1 in every 84,984 girls born was named Mckennah. FALLING Recent data shows the name is currently falling.