What does Finnian mean?
Finnian \f(in)-nian\ as a boys' name is of Irish and Gaelic origin, and the meaning of Finnian is "white, fair". Anglicized form of Gaelic FinnÚn, derived from finn. Also used as pet form of Finn. The 1968 film "Finian's Rainbow" was Fred Astaire's last musical. The name of several early saints, one of whom may have been the same person as Saint Finbar. Saint Finnian of Clonard (sixth century) was called "The Teacher of Irish Saints" because many students at his school became prominent ecclesiastics.
Finnian is an uncommonly occurring first name for men. Finnian is also an uncommon surname for all people. (2000 U.S. Census)
Below is a charted comparison of the usage of the boy name Finnian and corresponding names. Barry, Finn (#234 a year ago) and Fionn are the prominent variation forms of Finnian (#unlisted). These boy names reached the peak of their popularity during the years 1950-1959 (usage of 0.3083%) and are somewhat less popular today (usage 0.2553%, down 17.2%), with the version Barry becoming less fashionable. Finn (#234) is the most chic birth name here. (Top 1000 Birth Names Statistics, 2014)