If I should believe Wiki: "A guild is an association of craftspeople in a particular trade". In that line of reasoning a 'generic' name like 'warriors guild', 'explorers guild' or 'crafters guild' are in fact the only guilds that even comply to this defenition. These kind of names wouldn't be very imaginative but in real life but would be to the point concerning the meaning of a guild, being just that: a group of people with the same profession that is somewhat organised. The problem isn't in fact the lack of good guild names, it is a lack of professions that can be professed. But to my knowledge certain implemented professions don't formally have guilds like smelters, weapon or armor repairers or miners. There's not even a magic based guild, though learning the Ways seems to be an important part of Yliakum society. The rest of the profession based guilds could of course be RP'ed like cooks, tailors, undertakers, lawyers, Hydlaa tour guides and you name it. A very good initiative in this direction was a guild set up for having a newspaper published. However this hardly ever seems te be the case, because the focus in the game is very oriented towards fighting. For an RP based game it would be advisable to have more of the professions that aren't (directly or indirectly) related to combat.
And for the rest references to certain governmental structures like empires, republics and royal houses or cities that seem to have vanished appear to be popular. Since none of these places are mentioned in the 'official' history or geography of Yliakum, all these guild names could be considered out of the framework that was set by the development team. Having a small number of inhabitants as Yliakum seems to have its not likely to have multiple governmental structures in place. In real life I'm a city planner and looking al the number of 20 vigesimi (comming from the Craft Guilds), the fixed residents (NPC's) and commuters (players) and the available housing and facilities in the Capitol (Hydlaa) I would estimate the total inhabitants of this level of the Crystal at a few thousand at most. Of course the remote caves could harbor miniature 'kingdoms' or 'empires' like we see in the remote mountainous regions of Europe (Liechtenstein, Andorra). These would however have to be (near) self sufficient communities of a few hundred inhabitants at most, not grand houses or empires. In fact if there was such a thing as an Yliakum wide movement undermining the semi-totallitary (a hereditary system for Vigesimi resembles nobility) structure, I would've sent the Shadow Squadron and/or the Sunshine Squadron to eradicate it long ago, seeing as there is enough trouble involving the creatures from the Stone Labyrinths and the Derghir to have civil unrest.
For the rest there are guilds that have pretty names like Vlahii and Nomothetes, but those names come from languages that are not part of Yliakum. A guild based on ancient Kran I can relate to, but Latin or Greek simply just out of context. Of course there are guilds that are race based too. Seeing as the current 'guild' system does include the traditional 'clan' structures, this is kinda understandable. Most of these guilds seem to involve Enkidukai or Dwarves, races that seem to have stronger bonds due to their overall nature. RP-wise they should be regarded as such, clans, not as guilds in the meaning stated above.
And there's of course the 'of the light', 'of the crystal' guilds that are appealing to the general theme and usually have a decent background story but don't really excell in orriginality. And of course there are guilds that have names that should've been banned from the start like 'Sheepless'. To my knowledge Yliakum doesn't have any sheep and in fact never had any sheep, so 'sheep' itself would be unknown. OOC-ly named guilds like that should in my opinion without a thought be disbanned to maintain integrety of the RP setting of the game. Of course you could reason that 'guilds' don't all wear insignia or stuff like that, but from a player's point of view the damage is allready done then.
Original names? make a guild of bookmakers and help darphen with his dark ventures. start a archeological guild helping to uncover traesure with canyt and nyshyn. Become a poet and start a writer's guild that hold lectures and has award ceremonies. Its not that hard, just needs a bit more work then 'my parents were royalty from a far away kingdom that doesn't excist anymore' or 'an unknown god asked me kindly to rule Yliakum'.
[Edit] How about a pet trainers guild? I'd like to see yulbar performing tricks
