What do Beyonce and Jay Z's twin names really mean?

The world got pretty excited when Beyonce and Jay Z first announced Blue Ivy's name back in 2012.

So, perhaps unsurprisingly, there's been twice as much furore over the monikers of their latest additions to the family - Rumi and Sir Carter, who dropped last month.

The newborns' names were detailed in a report by TMZ , who claim the power couple have already registered both in legal documents.

The trademarks are 'for fragrances, cosmetics, key chains, baby teething rings, strollers, mugs, water bottles, hair ribbons, playing cards, tote bags, sports balls, rattles and novelty items', they state.

But what exactly do they mean? And what influence will they have on their future lives?

Well, Rumi appears to be an homage to a 13th century Sunni Muslim poet of the same name, Jalauddin Rumi.

He's world-renowned for his spiritual legacy which has lasted for centuries and suggests some deep thinking on behalf of Mr and Mrs Carter - although some might also question whether it has deliberately religious connotations.

The name also derives from the Greek word for 'Romans' and makes subtle reference to the Roman Empire. In fact, to this day the city of Rome is known in modern Arabic as Rūmā.

Meanwhile, the name Sir is referenced in one of Rumi's most famous poems.

It states: “ Bring the pure wine of love and freedom. But sir, a tornado is coming. More wine, we'll teach this storm

A thing or two about whirling. ”

According to website Behind The Name, Sir is the Catalan form of Syrus, or Cyrus, which means 'throne'.

Given Beyonce and Jay Z are the king and queen of pop, that's pretty fitting - but other celebs have also got in on the act.