Since your first inspiration was Leo, and as the Sun, the ruler of Leo, is in Leo for the duration of this contest, it seems meet and right that we stay close to that first inspiration and change the name to Soleo ("Sol" = the Roman personification of the Sun).
Wanna blog? So Leo. Wanna thread? So Leo... etc.
If that domain is not available, an alternative might be heleos.io which is almost an anagram for "helios" and "leo" - the perfect anagram would be helleos.io for those who want a more hellish or hello-ish feel to the name!
So there you go:
Soleo
Solleo
Heleos
Helleos