Kathleene, of Scottish origin, is derived from the Gaelic 'Caitlín', meaning 'pure'. It's a feminine form of the ancient Celtic name Catheline, which itself evolved from the Latin 'Catherine'. Kathleene was particularly popular in Scotland during the 19th century but has since become quite rare. Its variant spellings include Caitleen and Katherline.
"Kathleene's popularity peaked between 1947 to 1950, with a high of 32 births in 1947. It then steadily declined, dropping to just 5 births in 1995."