The name reflects centuries of European exploration and colonial administration:
Dutch navigators charted the western coast, naming the continent "Nieuw Holland" (New Holland), considering it part of a larger southern landmass.
The British established the Swan River Colony near present-day Perth—the first permanent European settlement on the western coast.
The colony was formally renamed "Western Australia" to distinguish it from New South Wales on the eastern coast. The change:
The name is straightforward: the colony occupied the western portion of the Australian continent. It provided clear differentiation in an era of expanding British colonies—Van Diemen's Land (Tasmania), South Australia, Victoria, Queensland—all emerging around the same period.
Western Australia became a state in the Commonwealth of Australia upon federation in 1901, retaining its descriptive name.