Seeley is an uncommon, unisex given name of English origin. It is derived from the Old English word 'sīgl', which means 'victory'. The name has been used sparingly throughout history but gained some recognition in the 19th century when it was employed by American author and poet John Greenleaf Whittier for one of his characters.
The number of births named Seeley increased notably from the late 20th century to around 2017, peaking at 40 births in 2016, but has since declined.