Britannia

Also Romani (archaic): http://gypsygenealogy.org/2019/12/30/lace-and-prophecies/
http://gypsygenealogy.org/2020/04/09/the-heart-of-the-matter/

It's rare in the UK, but it has been consistently used and is still in use here, and sounds no weirder to me than a lot of other names that are currently popular.