Keely is an anglicized form of the Irish surname Ó Caollaidhe, from the Gaelic caol, which means "slender" and is often rendered as "graceful". It has been used as a girls' name mainly in the United States and Australia since the mid-20th century. Keely peaked at number 610 in 2000 and left the US top 1000 soon afterward; in 2025 it ranks number 2737 with 63 births.