Meghan Markle and Prince Harry have yet to reveal whether they are having a boy or a girl (or twins, if rumors are to be believed), but they are said to have nailed down potential baby names if their child turns out to be a boy.

While the Duke and Duchess of Sussex have yet to settle on one name, Life & Style Magazine reports they have narrowed it down to two royal monikers. “The top contenders are Charles, after Harry’s father, and Arthur,” shared a source. “But nothing’s definite yet.”

Arthur was thought to be a strong contender for Prince William and Kate Middleton’s third child ahead of his arrival in April. The couple ended up naming their son, now 7-months-old, Prince Louis.

While Meghan and Harry are said to have a couple of names in mind, they may end up having to use both. The magazine also reports that Meghan was recently caught calling her baby bump “them” and has been seeing a medical consultant that specializes in multiples.

“Meghan’s hinted numerous times that ‘double trouble’ lies ahead,” an insider said.

meghan and harry The Duke and Duchess of Sussex arrive at The Royal Variety Performance 2018 at London Palladium on Nov. 19, 2018 in London, England. It is rumored that the couple has already picked out boy baby names. Photo: Chris Jackson/Getty Images