The 18-year-old is making rapid gains in Britain, starring for the England under-20 team and already being talked off as a future test player.
The son of former Samoan player, Mike Umaga, Jacob was born in Britain after his family moved there.
He's a No 10 who can play centre and he's making rapid gains, having also played for England at under-18s and touch rugby. He's now with the Wasps club.
He loves his Polynesian roots but plays down his famous surname.
"A few people put more pressure on me because of the name," Umaga told the Daily Mail.