"David speaks to so many different people. I think that's what's unique about him," said Stacy Jones, founder and CEO of the marketing agency Hollywood Branded.

"He brings in the female demographic because he is so sexy - but he appeals to men. He's an honest, good, authentic, down-to-earth type of individual. So you don't really get affronted by him."

She felt Beckham had achieved something few celebrities manage, moving effortlessly between football, fashion, entertainment, business and the cult of celebrity.

On Hermosa Beach, south of Los Angeles, hundreds of fans gathered to watch Spain reach the World Cup final at an event organised by LA Galaxy - the club Beckham joined in 2007 from Real Madrid.

Ask fans what comes to mind when they hear the name David Beckham and the answers come quickly.

"Bending it."

"His free-kicks."

"Victoria Beckham."

"Handsome."

"The Spice Girls."

"The McDonald's advert."

"David Beckham was a really good player for England, but he's doing too many commercials now," said one football fan.

For Megan Hapeman, it's the recent McDonald's advert in which Beckham hopes to receive a cup featuring his own face.

Her six-year-old son Oliver proudly told me he still has one.

"When I got it, I was pretty proud," he said. "Because Mommy liked it, I liked it too."

That's exactly what brands are buying.

Beckham transcends clubs, generations and even football itself.

That broad appeal didn't happen by accident. It was built on Beckham's football legacy in America.

He remains the player with the trademark free-kicks, part of Manchester United's Treble-winning side in 1999, England captain and one of Real Madrid's original Galácticos.

Dan Courtemanche, Major League Soccer's executive vice-president and chief communications officer, admitted Beckham's influence on the game in America cannot be overstated.

"I always tell people he changed the fate of American soccer. Not once, but twice," he said.

When Beckham signed for LA Galaxy 19 years ago, stadiums across Major League Soccer sold out before he had even played a competitive match.

The league needed credibility and he gave it something even broader: mainstream celebrity.

Sixteen years later, Beckham helped persuade Argentina icon Messi to choose Inter Miami over rival offers globally - another moment that transformed MLS, according to Courtemanche.

"Lionel Messi decided to make Major League Soccer his league of choice and Inter Miami his club of choice," he added. "Again, it took us to a whole other level."

Tom Braun, LA Galaxy's president and chief operating officer, said Beckham's influence has stretched way beyond football.

"David's an iconic figure in our sport and our culture," he explained.

"He's built a business around his brand and continues to resonate with people."

The evolution of the 51-year-old, who also played for AC Milan and Paris St-Germain before retiring in 2013, was perhaps best symbolised this summer on Hollywood Boulevard.

When Beckham accepted his star on the Walk of Fame, he reflected he had never imagined "a working-class English footballer" would receive such an honour.

The recognition celebrated not only the life of Beckham the footballer, but Beckham the cultural figure.

"David Beckham, to America, is the World Cup," Jones said.

"He is soccer to us."

Having arrived in Los Angeles promising to grow the game, Beckham is still helping sell football to America.

Only now, he's doing it not with a free-kick, but with a brand.