chipmunk (n.)
1829 (also chitmunk, 1832), from Algonquian, probably Ojibwa ajidamoo (in the Ottawa dialect ajidamoonh) "red squirrel," literally "head first," or "one who descends trees headlong" (containing ajid- "upside down"), probably influenced by English chip and mink. Other early names for it included ground squirrel and striped squirrel.