Definitions of quill:

• noun:   a stiff hollow protective spine on a porcupine or hedgehog
• noun:   the hollow shaft of a feather
• noun:   pen made from a bird's feather
• noun:   any of the larger wing or tail feathers of a bird
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #16040)