Cavan is a suburb north of Adelaide

Adelaide

Adelaide is the capital city of South Australia and the fifth-largest city in Australia. Adelaide has an estimated population of more than 1.2 million...

, within the City of Salisbury

City of Salisbury

The City of Salisbury is a local government area located on the northern fringes of Adelaide, South Australia. It has an estimated population of 130,022 people and encompasses an area of 158km². The council's main offices are situated in the Salisbury central business district.-Suburbs:-External...

 local government area.

The suburb was either named by Daniel Brady or B. Gillick, both probably Irish immigrants, after Cavan

Cavan

Cavan is the county town of County Cavan in the Republic of Ireland. The town lies in the north central part of Ireland, near the border with Northern Ireland...

 in County Cavan

County Cavan

County Cavan is a county in Ireland. It is part of the Border Region and is also located in the province of Ulster. It is named after the town of Cavan. Cavan County Council is the local authority for the county...

, Republic of Ireland

Republic of Ireland

Ireland , described as the Republic of Ireland , is a sovereign state in Europe occupying approximately five-sixths of the island of the same name. Its capital is Dublin. Ireland, which had a population of 4.58 million in 2011, is a constitutional republic governed as a parliamentary democracy,...

. Brady purchased land and established the 1849 Cross Keys Hotel and Gillick the 1855 Cavan Arms Hotel.

Cavan Post Office opened on 2 March 1959 and closed in 1974.