Wonga

Wonga began in Australia as a bird name. Around Sydney, Aboriginal languages including Dharug used forms like wonga for the wonga pigeon, a large ground-feeding pigeon of eastern forests, though the exact pre-contact form is imperfectly documented. Colonists adopted the word in the early nineteenth century. Naturalists tended to preserve Indigenous bird names when the birds resisted easier European labels.

Then English performed one of its stranger tricks. In Britain, especially by the late twentieth century, wonga became slang for money. Some etymologists trace this to Romany, where a related form meant coal and, by extension, cash, entering broader criminal and street cant by that route. The Australian bird name and the British money slang meet only in spelling, not in origin.

The Australian word and the British slang form intersect in spelling and diverge in life. That is not rare in English, but it is often misunderstood. People assume continuity where there is only collision.

Today wonga still names the pigeon in Australian usage while British English hears cash. The older Aboriginal word remains rooted in country and species, even when modern ears chase another meaning. Sound travels faster than history.