Mackinley is a distinctive girls' name in United States, ranking #7373 in 1998 with 13 recorded births. The name reached its all-time peak in 2018 with 28 births ranking #4843. Since 1996, the popularity has increased by 85.7%. In 1998, approximately 1 in every 135,915 girls born was named Mackinley. FALLING Recent data shows the name is currently falling.