Guy Ritchie has named his youngest son Rafael.

The Sherlock Holmes: A Game of Shadows director and his model girlfriend, Jacqui Ainsley, welcomed their first child together last September, but have only now revealed his name.

"We thought Raffie Ritchie sounded really cute when shortened. His older brother, Rocco, helped choose the name - we were throwing ideas out there as a family and it stuck from early on," Jacqui explained.

Guy, 43, has Rocco, 11, and adopted son David, six, from his marriage to singer Madonna, who he divorced in 2008. Raphael is Jacqui's first child.

"He has two great brothers which is really lovely. I'm the happiest girl in the world and loving motherhood," Jacqui, 30, added.

Meanwhile, Guy is rumored to have signed up to direct a new version of pirate adventure Treasure Island.