Woodlice are my favourite for this. From the wiki:

Common names include:

• armadillo bug
• boat-builder (Newfoundland, Canada)
• butcher boy or butchy boy (Australia, mostly around Melbourne)
• carpenter or cafner (Newfoundland and Labrador, Canada)
• cheeselog (Reading, England)
• cheesy bobs (Guildford, England)
• cheesy bug (North West Kent, Gravesend, England)
• chiggy pig (Devon, England)
• chisel pig
• chucky pig (Devon, Gloucestershire, Herefordshire, England)
• doodlebug (also used for the larva of an antlion and for the cockchafer)
• fat pig (Ireland)
• gramersow (Cornwall, England)
• hog-louse
• millipedus
• QuaQua regional to Beddau and Keppoch Street Roath
• mochyn coed ('tree pig'), pryf lludw ('ash bug'), granny grey in Wales
• pill bug (usually applied only to the genus Armadillidium)
• potato bug
• roll up bug
• roly-poly
• slater (Scotland, Ulster, New Zealand and Australia)
• sow bug
• woodbunter
• wood bug (British Columbia, Canada)