This item is acquired in-game. See its sources below.
In their in-game specialization descriptions, these specs name axes among their preferred weapons:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Blizzard numbers items as they are created, so the named items next to ID 224467 (224462 to 224472) were usually added in the same batch as Forgotten Axe: the same quest line, zone, vendor or reward set.
The Ear ID 224462 · Quest "It's definitely a human ear."
Lily's Locket ID 224463 · Quest "The Inscription reads, Glow brightly, with love from Gerta."
Demonic Healthstone ID 224464 · Consumable · item level 5
Unusual Potato ID 224465 · Quest "It bears a striking resemblance to General Steelstrike... if you squint."
Wilber The Chicken ID 224466 · Quest "Just as surprised as you to find itself in this predicament."
Eternal Netherwind Robes ID 224468 · Armor - Cloth
Eternal Netherwind Boots ID 224469 · Armor - Cloth
Eternal Netherwind Gloves ID 224470 · Armor - Cloth
Eternal Netherwind Crown ID 224471 · Armor - Cloth
Eternal Netherwind Pants ID 224472 · Armor - ClothThe raw ItemSparse values for item 224467 in the current client build.
Read from the World of Warcraft client build files: Item, ItemSparse, Lock, Holidays, AreaTable and CollectableSourceVendor.
Forgotten Axe is not traded on the Auction House, so it has no Auction House price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB