Keenan is an Irish given name of unknown meaning, believed to have originated as a variant spelling of Kevin. It gained popularity in the United States during the mid-20th century and has since been used as both a masculine and unisex name.
The name Keenan had a significant surge in popularity between 1979 and 1991, with a peak of 18 births in 1991, nearly three times the average of around six births per year during other periods. After 2000, the number of annual births named Keenan generally ranged from five to ten, with occasional spikes up to eleven or thirteen.