The couple's first child is due any day now, sending bookmakers into a frenzy with a flurry of last-minute bets, according to APTN.
British bookmaker William Hill had to close betting on names because of the heavy volume of bets in favor of a girl.
While most people put their money on Diana, Harry's mother's name, other names could be more lucrative.
"The sort of big ones that are being backed are Rose ... I think that's got a chance," Hill said. "Grace which has done extremely well; Isabella, which I again I like very much."
Another name emerging as a big contender? Elizabeth.
Despite it being the name of the current queen, experts say it may not be out of the question.
"Apparently they have an extremely close relationship and I can just imagine for whatever reason Harry wondering and saying, 'Granny, do you know, do you mind if I call my daughter Elizabeth?' and I can imagine her saying yes," Hill said.
And after all, this couple is not keeping with traditions. Their birth announcement and reveal won't be as grand as those of previous royal babies. But behind the scenes, they'll face new parenting challenges just like everyone else.
"Hopefully, it will go well for them and they will have a smooth birth and hopefully it will be a good baby and sleep lots for them so that they can get some rest," Hill said.