There are multiple reasons to call the game Flyff2 in the site's source code even if it's not actually Flyff 2, such as:
- The project name was originally Flyff 2, back before they decided that they weren't actually going to make it a sequel, as has already been mentioned.
- The game draws heavily on Flyff, such as towns and classes, to the point where it would be considered a ripoff if made by any other company, yet isn't explicitly a sequel.
- The devs were hoping to recreate the success and devotion they had with Flyff.
- They wanted to make it a spiritual successor to Flyff, even if it's not an actual sequel.
- Oh, I don't know, maybe because it's F2: Flying Fortress, or F2:FlyF. Now, what would you get if you put the F2 at the end instead of the start?