Here is a listing of guild ranks:
(Note: These are ranks gained by guild experience points. Other ranks are obtainable through honorable deeds beneficial to the guild.)
Assyrian Eclipse: 40M+ gxp
Shimmering Sentinel: 20M to 40M gxp
Master of the Shining Blade: 10M to 20M gxp
Hero of the Solar Winds: 5M to 10M gxp
Blazing Champion: 2.5M to 5M gxp
Resplendent Knight: 1M to 2.5M gxp
Radiant Warrior: 250K to 1 million gxp
Golden Spearman: 50K to 250K gxp
Solar Apprentice: trial member, <50,000 guild xp
Seneschal of Light, Solis Susceptor, Ghost, and Darkness are special ranks.