Fallon is of Irish origin, derived from the surname Ó Fearghail, which translates to 'descendant of Feargal'. The name gained prominence through comedian and television host Jimmy Fallon, who was born with the name James. It has since become more widely recognized and used as a given name, particularly for girls. However, it remains unisex in nature. The name Fallon is often associated with strength and leadership due to its Irish roots, reflecting the qualities of Feargal.
The name Fallon experienced a significant increase in popularity over the years, with a steady rise from the 1970s to peak in the early 2010s.