Britney is of American origin and means "English nobility." It gained popularity in the United States during the 1980s, peaking in the late 1990s. The name was notably popularized by pop singer Britney Spears, born on December 2nd, 1981.
"The name Britne experienced significant popularity in the late 1980s to early 1990s, with a peak of 38 births in 1990. However, its usage has declined considerably since then."