From Britain
A creative modern spelling of Brittany, which originally referred to the region in northwest France settled by Celtic Britons. It became a popular given name in the United States during the late 20th century.
Less common today
Bryttani isn't in the latest US Top 1000. It last peaked at #4,376 in 1990.
US births per 5-year period, 1990βpresent (SSA data).