Britannia Idalia Gumbs, known as Idalia Gumbs (née Carter; 1933 – 2000), was an Anguillan politician. She was the first woman to sit in the Anguilla House of Assembly.
It's no worse than "Brittany", which is the literal name for a region in France. As to whether it will become popular, that depends on how Britain itself is viewed by the general public in the near future.
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.
Britannia is famous for appearing on Pound Sterling (British Money) 50p coins. However, the Royal Mint is currently in the stages of redesigning the coins and Britannia will be replaced with part of the Queen's coats of arms. The 1p, 2p, 5p, 10p, 20p and 50p which together make the picture of the coat of arms and the new £1 coins will have the complete coat of arms. There is talk of BRitannia appearing on the redesigned £2 coins however.
Pretty, but, like many other commenters have said, possibly not the most practical in certain countries (England). My suggestion is the combo 'Ruby Tanya' which does sound slightly like 'Rule Britannia'.
Just stay out of Europe of you use this pompous and pretentious name for your child, as it sounds very, very bizarre in Europe. This is actually the Finnish word for 'Britain', and I'm pretty sure it's the equivalent of 'Britain' in other languages as well. The name would, of course, be an impossibility in Britain itself.
I love this name because it's a place name, but not a blatant place name, like London. The only reason I don't like it is because it is so close to Brittany.
I adore this name. I think it is better than Brittany/Britney, and is the old Roman name for the country of what is now Great Britain (Britain is also a name I like for a boy). I named a cat Britannia Morgan LeFay, for the country, and King Arthur's younger half sister, Morgan LeFay.