What is the name of the largest alluvial gold nugget ever found?

The largest alluvial gold nugget ever found was the Welcome Stranger.

John Deason and Richard Oates discovered it on 5 February 1869 near Moliagul in Victoria, Australia. It lay just 3 centimetres below the surface, near the base of a tree, making its discovery remarkable even by the standards of the Victorian gold rush.

The nugget had a gross weight of about 3,523.5 troy ounces, or roughly 241 pounds. After trimming and processing, it yielded more than 2,200 troy ounces of gold. Because no local scales could weigh it intact, a blacksmith broke it into pieces on an anvil so it could be handled and measured.

The Welcome Stranger is often confused with the Welcome Nugget, found near Ballarat in 1858. The Welcome Nugget weighed about 2,217 troy ounces and is generally considered the second-largest major nugget. The Welcome Stranger itself was melted down soon after discovery, so no original specimen survives; replicas are displayed in Victoria.