Marykathryn is a distinctive girls' name in United States, ranking #5617 in 2000 with 20 recorded births. The name reached its all-time peak in 2000 with 20 births ranking #5617. Since 1996, the popularity has increased by 11.1%. In 2000, approximately 1 in every 90,799 girls born was named Marykathryn. FALLING Recent data shows the name is currently falling.