The former No. 1 broke the news at the launch of his first apparel line, AMC, in London. (Getty Images)

On Tuesday, Andy Murray was in London to launch his first apparel line in partnership with innovative luxury brand Castore. Named AMC, all products in the tennis collection have been produced with recycled yarn and regenerated nylon, and pay homage to a place of significance for Murray, 

Fielding a range of questions at the kickoff event, Murray also provided a much-awaited update on the birth of his son. The former world No. 1 revealed wife Kim chose the name Teddy and the two decided to keep Andy's middle name, Barron, in the family.

Murray added, "I don’t actually love the name, but my dad’s middle name was Barron, his dad was Barron, my grandad’s dad, too, so I kept that."

At home for an extended period after winning the title in Antwerp last month—his first triumph since he underwent a resurfacing procedure on his right hip in January—Murray also revealed he gained nearly 10 pounds after finding himself snacking on sweets like cake and chocolate biscuits. It prompted the 32-year-old to reflect and throw shade at former coach Ivan Lendl.

"He’ll probably kill me for saying this, but I always said I don’t want to end up with what happened to Ivan," stated Murray. "When he was playing, he was in great shape and very thin. And when he stopped things went south, so I need to avoid that.”

Murray has since flown to Madrid with his Davis Cup teammates, as Great Britain prepares for the reimagined Davis Cup Finals. Joined by brother Jamie Murray, Kyle Edmund, Dan Evans and Neal Skupski, the fifth seeded nation is in Group E alongside Kazakhstan and the Netherlands.