From Britain or land of the Britons
A modern spelling variation of Brittany, which originally referred to the region in northwest France settled by Britons. It gained immense popularity as a given name in the United States during the 1980s and 1990s.
Less common today
Bryttany isn't in the latest US Top 1000. It last peaked at #4,820 in 1994.
US births per 5-year period, 1990βpresent (SSA data).