Wimbledon champ Andy Murray
While most of it is done tongue in cheek, some confusion reigns over its origin and whether indeed the newly crowned Wimbledon champion is in fact another in a long line of famous Hammers fans.
The Scot triumphed over Canadian Milos Raonic in South West London on Sunday afternoon.
But does Murray have the same passion for the claret and blue?
Andy the Hammer?
And that was the cue for a picture of Andy Murray wearing the shirt of the East Londoners to make its way online once again.
But where does it come from and is Andy a Hammer?
Popular Hammers website West Ham Til I Die list Murray as one of their celebrity followers.
But while Murray has a number of West Ham supporting friends, it seems the explanation comes from back in 2007.
West Ham's Anton Ferdinand wrote on the shirt sent to Murray
Heard the one about Andy Murray, Anton Ferdinand and an Italian sports psychologist?
Ahead of his involvement in the US Open in August that year, Murray was worried about competing with a wrist injury and turned to Italian sports psychologist Roberto Forzoni for help.
The psychologist had been at West Ham for the final 10 matches of the season before as they avoided relegation in the famous great escape.
Forzoni told Murray to watch footage of his pre-injury forehand at its best but he also had more wise words for the star, scrawled on a West Ham shirt by Anton Ferdinand.
West Ham fans
Hammers take great delight in claiming Murray
The former Hammers defender and brother of Rio gave Forzoni a West Ham shirt signed by the squad to pass on to Murray after being impressed by a YouTube video of him juggling a tennis ball with his feet - as reported by the Telegraph at the time.
Ferdinand had written: "Believe to achieve" on the shirt and Murray wore the shirt as a show of gratitude.
Whether Ferdinand's words were the foundation for Murray's rise to stardom we don't know, but Hammers fans will have some fun claiming it all the same.