Lillie is a variation (English) of Lilian (English, French, and German).
Lillie is also a diminutive form of Lily (English).
Lillie is an all-time favorite. Today it is still a fairly popular baby name for girls, though it was in more widespread use before. In 1900, 0.630% of baby girls were given the name Lillie. It ranked at #40 then. The baby name has since fallen from favor, and it is of only very light use in recent years. In 2018, it ranked at #668 with a usage of 0.024%. Out of the group of girl names directly linked to Lillie, Lily was the most popular. It was used 13 times more than Lillie in 2018. The name Lillie has been mostly given to girls, although it has also been used as a boy name in the past century. In 1905, the name Lillie was given to 49 times as many girls than boys.
† Pronunciation for Lillie: L as in "lay (L.EY)" ; IH as in "it (IH.T)" ; IY as in "eat (IY.T)"