From Britain and grace
A modern compound name combining Brittany, referring to the region in France or the Celtic people of Britain, and Ann, derived from the Hebrew Hannah. It blends the geographical heritage of the former with the traditional virtue of the latter.
Less common today
Brittanyann isn't in the latest US Top 1000. It last peaked at #5,386 in 1991.
US births per 5-year period, 1990βpresent (SSA data).