We already know there are more male CEO's named John, Peter and David than there are female CEO's, and in South Australia it's become apparent there are just as many "Steves" as there are women in cabinet.

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While the state's new-look parliament is younger and more gender-diverse its proliferation of the namesake was noted during the first day back at Parliament.

A total of 47 new and returning Lower House MPs, and 22 new and returning Upper House MPs, swore their allegiance to the Queen as part of the traditional pomp and ceremony of the day.

Newly-minted Premier Steven Marshall was sworn in alongside Liberal MPs Stephen Patterson and Steve Murray, and Labor MP Stephen Mullighan, in what the clerk of the house described as a "quartet of Stephens".

But that's not all.

There's also Liberal Stephen Wade — who sits in the Upper House — and Stephan Knoll in the Lower House.

Mr Marshall, Mr Wade and Mr Knoll are all cabinet members, equalling its three female cabinet members — Vickie Chapman, Michelle Lensink and Rachel Sanderson.

A 'long way to go' but more women in the Upper House

MPs Steven Marshall, Stephen Mullighan, Steve Murray and Stephen Patterson swear allegiance in Parliament. ( ABC News: Nick Harmsen )

Greens MLC Tammy Franks said she had also noticed the number of "Steves" filling the halls of Parliament.

"It is a bit of a joke, but it is quite a serious issue," she said.

"This time there were more women elected in the Upper House, but we've still got a long way to go [to equal gender representation]."

In the Legislative Council, new Labor MLCs Emily Bourke, Irene Pnevmatikos, Clare Scriven, and SA Best's Connie Bonaros were among the women sworn in.

Liberal Andrew McLachlan was elected as President.

"I thank the chamber for the honour of electing me to be the president of the council. I will faithfully and honourably serve the council to the best of my abilities," he said.

New Parliament has some young representation

In the House of Assembly, the man who saw off a high-profile challenge from Nick Xenophon, Vincent Tarzia, was elected Speaker.

At just 31-years-old, it's believed he's the youngest person ever to hold the position.

"You surprised many of the pundits, many of the experts, but you did not surprise those how hard you have worked on behalf of the constituents of Hartley," Premier Steven Marshall said of Mr Tarzia.

"I have great confidence in how you will carry out the role bestowed on you by this house today," he said.

SA MPs in the Upper House, in the first joint sitting since the March election. ( ABC News: Nick Harmsen )

Opposition Leader Peter Malinauskas offered Labor's congratulations.

"You occupy an office of great importance in our parliamentary democracy... it is our hope you are independent and objective over the life of this Parliament," he said.

"As the new leader of the South Australian Parliamentary Labor Party, I'm eager to demonstrate that one can be passionate about and robust during debates while also maintaining a standard of civility."

Former premier and returning Cheltenham MP Jay Weatherill was notably absent — he had booked an overseas holiday before the sitting dates were finalised.

MPs will visit Government House before Governor Hieu Van Le addresses Parliament.