According to the Wikipedia entry, which obviously pulled from some authoritative source--because, let's face it, after a while, you just can't keep making this stuff up--there are 873 people in the line of succession to the throne of England, including HM The Queen herself.
Between them, there are about 10,000 names, including just about every English, German (Queen Victoria and co were German, after all), and Russian-sounding aristo name imaginable. Thanks to Queen Victoria, the list ropes in the royal families of half a dozen other countries (including Greece, which gave its royals the boot a generation ago, sorry to bring that up, Pavlos.) The only thing missing is Catholics, since being or marrying a Catholic makes you ineligible for the big job. Who knows, you may already be on there?
Line of succession to the British Throne [wikipedia.org]