From Britain or the land of the Britons
A Latinate elaboration of Britannia, the Roman personification of the British Isles. It historically refers to the Roman province and has long been used as a poetic or patriotic name for the United Kingdom.
Less common today
Brittania isn't in the latest US Top 1000. It last peaked at #4,964 in 1995.
US births per 5-year period, 1990–present (SSA data).
The female personification of the British Isles · Roman Mythology and British Folklore
