Naming things in games is great fun, and I like trying to find names that are distinct as well as effective (and unoffensive).
These are the guild names that stuck out for an Australian guild, which wouldn’t take itself too seriously.
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Cooking With Gas
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A Dead Cert
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A Dogs Breakfast
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Elbow Grease
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Five Finger Discount
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Give it Heaps
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Home and Hosed
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On the Nose
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On For Young And Old
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Spit the Dummy
Some other words that are distinctly Aus, but I couldn’t think of a good combination: Dead Horse, BYO, cark it, dodgy, down under, dutch oven, esky, lucky country, bloody, strewth.
TyphoonAndrew's - Eye of the Storm 
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You forgot the most obvious of all great Aussie guild names:
She’ll Be Right
or
She’ll Be Right Mate
Sweet site, I hadn’t noticed typhoonandrew.wordpress.com before in my searches! Keep up the great work!
Bloody oath!