"Galeo" might also be a shortened variant of "Galileo", after the Italian scientist who publicly spoke of his findings that the Earth went around the Sun. I guess "Copernicus" was a little too long-winded, and Copernicus himself was a little too humble, to be made into a Pokémon name.Something can actually be perceived from 'Solgaleo'. 'Sol' obviously being 'solar' for the sun, and 'leo' obviously being 'lion'. It's not much at all, but it does give a vague idea as to the aesthetics of the sun legendary.
Anyway, a sun lion design seems... well, I could believe it, and I'm not going to speculate on details or give counter-proposals, but giving us that just one generation after Pyroar? I mean, we have got legendaries related to/resembling previous generation Pokémon before, but then the two were usually both legendaries, and related to each other in some way (Moltres and Ho-Oh, Regis and Regigigas, etc.). It'd be strange for Game Freak to just repeat a previous design concept for an ordinary Pokémon a mere generation after its debut.