Kim Kardashian West and Kanye West can't agree on what to name their unborn son.

The couple, who already have two-year-old daughter North, are set to welcome a baby boy in December, but still can't decide what to christen him.

A source close to the duo claims the 38-year-old rapper recently proposed a ''unique'' family-inspired moniker, but added: ''Kim wasn't crazy about it.''

The reality TV star, who previously admitted rumours they were planning to call their son South made her ''want to roll my eyes,'' is in no rush to make a decision.

The insider told Us Weekly magazine: ''Kim won't solidify the name until the month she gives birth.''

The 'Keeping Up with the Kardashians' beauty is set to welcome her son into the world on Christmas Day (25.12.15), but ''will likely have a C-section'' because she suffers from placenta accreta, in which the placenta grows too deeply into the uterus.''

Though she has yet to officially schedule the procedure, the 34-year-old star has reserved a luxurious three-room, two-bathroom suite at Cedars-Sinai Medical Centre in Los Angeles for a few days around the holiday.