Warsong Howling Axe

Warsong Howling Axe is a two-handed axe that drops from Keli'dan the Breaker in the Blood Furnace wing of Hellfire Citadel.

Speculation
It should be noted that this same style of axe was used by Grom Hellscream, the last chieftain of the Warsong Clan. 'Warsong' and 'Howl' also appears in the item name which may suggest that this is in fact his axe or one of his axes. It could be possible he had several.

Another possibility is that this style of axe was standard equipment for the Warsong Clan, and that Grom, being chieftain, wielded the upgraded version; Gorehowl.