Meaning behind Harper Seven Beckham's unusual name as she celebrates 12th birthday

David and Victoria Beckham's youngest child celebrated her 12th birthday yesterday, but with the tributes pouring in for Harper Seven, fans have been left wondering about the meaning behind her unusual name.

I say 'unusual', but let's be honest, there's really no such thing as an unusual name these days, especially where celebrities are involved.

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We have directions (North West) and weather (Stormi) from the Kardashian-Jenners alone - and don't even get me started on Elon Musk's child X Æ A-Xii.

So with all of those names out there, having a number in a name isn't all that unusual. But why Seven in particular?

Well, Harper's dad David broke down the meaning behind his daughter's name in a video on Facebook after the couple welcomed their child on 10 July, 2011.

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Announcing the arrival on social media, David wrote: "I am so proud and excited to announce the birth of our daughter Harper Seven Beckham. She weighed a healthy 7lb and 10oz.

"Victoria is doing really well and her brothers are delighted to have a baby sister."

In his video, the football star explained they'd chosen the name Harper in honour of author Harper Lee, saying: "Victoria's favourite book isTo Kill A Mockingbird, it's a very strong, passionate book and the author was Harper Lee, and that is where Harper came from."

Now on to the middle name, which, according to David, is all about 'luck' and 'perfection'.

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He said: "The main reason behind Seven was it symbolises spiritual perfection - the seven wonders of the world, the seven colours of the rainbow - and in many cultures it is a lucky number."

"We love the name and we love Harper Seven," David continued. "We are very happy to have her in our lives and in our family, and it is an amazing time for our family right now."

So, that's what David's reasoning for the name was, but some other people have some theories of their own.

Many football fans couldn't help but notice that seven was a number special to David even before Harper came along, as it was his number when he played for Manchester United and England.

One fan speculated: "David Beckham's 4th child, a baby girl, has been named Harper Seven Beckham. Seven after his number at United. He's a true #mufc fan."

In fact, the dad has the roman numerals for seven (VII) tattooed on his right arm, so he's obviously a big fan of that particular digit.

Fans also found another link to the number in the month Harper was born - July, aka the seventh month of the year.

So there you have it - a name absolutely packed with meaning!