1. ITV Report

Why did Wayne and Coleen name their son Klay?

The couple have remained tight-lipped on the inspiration for their choice of name. Photo: Dave Thompson/PA Wire

Wayne and Coleen have added yet another unusual name to the celebrity baby pool with the announcement of the birth of their second son.

The naming of the younger brother of the Rooneys' three-year-old boy Kai has shown the couple establishing a Kardashian-esque preference for names beginning with K.

And the absence of an explanation for the rarely heard name has left others to guess the inspiration.

David and Victoria Beckham famously christened their son Brooklyn to mark the New York location where he was conceived.

The town of Klay resides in Bomi County in northwest Liberia. Credit: Google Maps

Yet it is inconceivable that the Rooneys will have ever visited the Liberian town of Klay, just over 20 miles north of the West African country's capital Monrovia, let alone made their decision there to bring a second child into the world.

More likely a source would be a sporting connection to the name.

Klay Thompson was part of his team's recently ended NBA playoff run in the final weeks of Coleen's pregnancy. Credit: REUTERS/Robert Galbraith

The Manchester United star may have once visited the Klay Sports Club in Paris or be paying a huge tribute to US basketball player Klay Thompson of the Golden State Warriors.

With our digital age making global radio local, Wayne and Coleen may be revealing themselves to be fans of long-running US radio station KLAY, which has broadcast to the state of Washington for the past half a century.

Far more likely is self-confessed boxing fanatic Wayne paying his respects, via a skewed spelling, of Muhammad Ali, who - of course - first entered the ring as Cassius Clay.

According to thinkbabynames.com, the 1990 US Census placed Klay a distant 71,347th out of the country's 88,799 most popular names.

Klay Rooney joins a host of unusually named babies born to famous parents, and can count himself fairly lucky that his moniker is far from being the most bizarre.

The godfather of crazy baby names Frank Zappa. Credit: Joe Sia/Starfile/EMPICS Entertainment

Beyonce and Jay-Z welcomed Blue Ivy Carter, American actor Jason Lee is the father of Pilot Inspektor Riesgraf Lee, while Jamie Oliver added Buddy Bear to his brood of Poppy Honey, Daisy Boo and Petal Blossom.

Other entrants include the son of Julia Roberts, Phinnaeus Walter Moder, and Gwen Stefani and Gavin Rossdale's boy Zuma Nesta Rock Rossdale.

Few, though, can rival rock's mad scientist Frank Zappa's titling of his children.

The American introduced Moon Unit, Dweezil and Diva to the world, along with the - relatively pedestrian - naming of his second son Ahmet.