The full name of Bella is known to be Isabella Marie “Bella” Swan. There are a lot of people who love the Twilight series because they like the fact that love sometimes knows no bounds. It does not mean that just because people are very different that they cannot fall in love.
There are some people who may not like it very much because it talks about the romance between people and vampires. Some people are fascinated with this because they would like to know how it is like to be in the “reel” world from time to time. Twilight seems to be set in a world that is not too different from what is considered real and this is part of its appeal.