andiron (n.)

"fire-dog, one of the pair of metallic stands used to support wood burned on an open hearth," c. 1300, from Old French andier "andiron," which is of unknown origin, perhaps from Gaulish *andero- "a young bull" (source also of Welsh anner "heifer"), which would make sense if they once had bull's heads cast onto them. Altered by influence of Middle English iren (see iron (n.)).