Britnie is of American origin, derived from the British Isles. It is a modern variant of Brittany, which originally referred to the historical region in northwest France. The name Britnie is composed of two elements: 'Britain' or 'Brittany', meaning 'land of the Britons', and '-ie', a suffix often used in girls' names to create diminutives or endearing forms. Thus, Britnie can be interpreted as a diminutive form of Brittany. The name gained popularity in the United States during the late 20th century but remains relatively rare compared to more traditional names. It is typically pronounced /BRIT-nee/.
"Britnie was quite popular as a baby girl name from the late 70s to the mid-80s, peaking at 76 births in 1988. However, its popularity declined sharply afterwards, with fewer than 30 births per year from 1997 onwards, and only single-digit numbers after 2005."