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By the way, this is a very interesting topic. It would be useful to somehow combine all the personal humorous names into one post (I think that translations from English to Russian also fall under this category).
Castle.
Archers - Achers.
Crusaders - Crusaders.
Fanatics - fans.
Champions - pony-boys.
Rampart.
Elves - Elves.
Dryads - trees, stumps.
Unicorns - horses, unicorns (although they are supposedly unicorns in English).
Stronghold.
Rooks - birdies.
Fortress.
Gorgon - cow, Moo-moo. :D
Dungeon.
Minotaurs - bull-calves.
Manticores - lions.
Tower.
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Inferno.
Imp - little bug.
Gog - sinners.
Cerberus - doggies.
Demons - bee-bee, mee-mee.
Devils - devils.
Necropolis.
Zombies - slowpokes.
Death Knights - old knights.
Bone Dragons - bone-boys. :)
Conjugation.
Fairies - pixels. :D
Air Elemental - breeze, Storms - storm-boy.
Fire Elemental - little fire, Electricity - electrician.
Psychic Elemental - psycho.
Firebird, Phoenix - both are firebirds.