Meaning and Name Origin
Killian \k(il)-lian\ as a boys' name is pronounced KIL-ee-an. It is of Irish and Gaelic origin, and the meaning of Killian is "bright-headed". From the same root as Kelly. The name is popular in France.
For more on this name, see also the related boy name Cillian.
Killian▲ has 1 more related form via Kelly: Kelley▼.
Killian is an uncommonly occurring first name for males but a very prominent last name for both adults and children (#2301 out of 88799, Top 3%). (2000 U.S. Census)
Charted below is the birth name popularity of Killian for boys. Killian entered the list in 1995 and reached its apex rank of #516 in the U.S. in the year 2014. (Top 1000 Birth Names Statistics, 2014)
Below is a charted comparison of the popularity of the boy name Killian and affiliated names. Kelly, Kelley and Cillian are the popular alternative forms of Killian (#516 last year). These boy names reached the apex of their popularity during 1960-1969 and have become much less popular since, with the forms Kelly and Kelley becoming less stylish. Killian (#516) is the most fashionable name for newborns in this list. (Top 1000 Birth Names Statistics, 2014)