I'm not a fan of replacing "x" with "gg" to make unfunny almost-puns such as "eggcelent" and "eggciting", but why anyone would think that you could do the same thing with "n" is beyond me. Maybe it's for trademark reasons, because they can be confident that the name won't already have been taken, or perhaps there's some European language in which it makes more sense than in English.
I suppose I should just be grateful it wasn't called "Breggsit".