Marykathryn is a distinctive girls' name in United States, ranking #9474 in 2003 with 11 recorded births. The name reached its all-time peak in 2000 with 20 births ranking #5617. Since 1996, the popularity has decreased by 38.9%. In 2003, approximately 1 in every 166,095 girls born was named Marykathryn. FALLING Recent data shows the name is currently falling.