Lyllian is a distinctive girls' name in United States, ranking #16339 in 2025 with 5 recorded births. This places Lyllian in the bottom 6% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2009 with 45 births ranking #3596. In 2025, approximately 1 in every 321,453 girls born was named Lyllian. FALLING Recent data shows the name is currently falling.