Where did the name swansea jacks come from?

The name "Swansea Jacks" comes from a legendary dog named Jack who rescued people from the docks in Swansea, Wales. Jack saved at least 27 people from drowning in the late 19th century, making him a local hero and symbol of courage and loyalty. The people of Swansea began to be referred to as "Jacks" in honor of this brave dog.