Gillian is a distinctive boys' name in United States, ranking #11190 in 2016 with 6 recorded births. This places Gillian in the bottom 21% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 8 births ranking #7392. In 2016, approximately 1 in every 316,202 boys born was named Gillian. FALLING Recent data shows the name is currently falling.