Gna

In Norse Mythology, Gna is Listed by Snorri as one of the divine goddesses but appears only to be a handmaiden of Frigg who sends her on errands. She has a swift horse named Hoof-flourisher which can run in the air and over water.

Source: Nicole Cherry, A list of Norse Beings, originally at www.ugcs.caltech.edu/~cherryne.
Copy still available at www.angelfire.com/wy/wyrd/list.html