Wow, thanks for the contributions and corrections, everyone! Yeah, Nuggie, I figure we can just copy+paste it with updates until it's added to a Wiki page. And if it turns out there's a much easier way to do this, we'll all get a hearty kek.
Guild1 possibly <Bears of Oboo> (GM guild)?
Guild2 <Dial a Port>
Guild3 <Auld Lang Syne>
Guild4 <Dark Men of Odus>
Guild5 <Venerate>
Guild6 <Sanctuary>
Guild7
Guild8 <Kingdom>
Guild9 <Friends Unanimous>
Guild10 <Castle>
Guild11 <Fury of Faith>
Guild12
Guild13
Guild14
Guild15
Guild16
Guild17 <Dial a Daniel>
Guild18 <House of Aegis>
Guild19
Guild20
Guild21
Guild22 <Equilibrium>
Guild23 <Black Lotus>
Guild24
Guild25 <Level Up>
Guild26 <Bloomin Onions>
Guild27
Guild28 <Hispartans>
Guild29 <Ravel>
Guild30
Guild31
Guild32
Guild33
Guild34
Guild35
Guild36 Entropy
Guild37
Guild38
Guild39
Guild40
Guild41
Guild42
Guild43
Guild44
Guild45 <Seal Team>
Guild46
Guild47
Guild48
Guild49 <Fires of Heaven>
Guild50
Guild51
Guild52 <The A-Team>
Guild53
Guild54 <Ironborn>
Guild55
Guild56 <Asgard>
Guild57
Guild58
Guild59
Guild60
Guild61
Guild62
Guild63
Guild64
Guild65
Guild66
Guild67 <Aussie Crew>
Guild68 <Akatsuki>
Guild69
Guild70
Guild71 <Odin>
Guild72
Guild73 <Lineage>
Guild74
Guild75
Guild76
Guild77
Guild78
Guild79
Guild80
Guild81
Guild82
Guild83
Guild84
Guild85
Guild86
Guild87
Guild88 <Doz>
Guild89
Guild90
Guild91 <Illuminatis>
Guild92 <Illuminatis> uh-oh, we gotta check this one
Guild93
Guild94
Guild95
Guild96
Guild97
Guild98
Guild99
Guild100
Guild101 <Fellowship of the Ding>
Guild102
Guild103
Guild104
Guild105 <Chilling Gaze>
Guild106
Guild107 <Guildless>
Guild108
Guild109 <Trade Federation>
Guild110 <Dynasty>
Guild111
Guild112
Guild113 <Solo Self Found>
Guild114
Guild115 <Sacred Phoenix>
Guild116 <Metal Guard>
Guild118 <Notekeepers>
Guild119 <Twisted Legends>
Guild120 <Legends Never Die>
Guild121 <The Alpha Betas>
Guild123 <Bind Affinity>
Guild124 <Euro Crew>
Guild125 <Imaginary Friends>
Guild126 <Corpse Draggers>
Guild127
Guild128 <The Galt Heretics>
Guild129 <Clockwork Watch>
Guild130
Guild131
Guild132 <Gnomeland Security>
Guild133
Guild134 <Gathered Might>
Guild135
Guild136 <Nostalgia>
Guild137
Guild138
Guild139
Guild140 <Sodden Seakings>
Guild141
Guild142
Guild143
Guild144
Guild145 <Norrathian Inquisition>
Guild146
Guild147
Guild148 <Red to Me>
Guild149 <Peacebringers>
Guild150 <Mental Militia>
Guild151
Guild152
Guild153 <Legends of Kesmai>
Guild154 <Baskin Vobobns>
Guild155 <Human Retribution>
Guild156
Guild157
Guild158
Guild159