The baby's name was meanwhile due to be announced on Friday, when the future regent is formally presented to the prime minister, speaker of parliament and the marshal of the realm at a traditional witness ceremony at Haga Palace, Victoria and Daniel's residence on the outskirts of Stockholm.

Media and betting sites speculated wildly Thursday about the choice of name.

According to TT, some likely ones include Christina, Desiree, Ulrika, Astrid, Margareta or Sophia, all of which are names used by the Swedish royal family in the past. Alice, the name of Victoria's late maternal grandmother, was also among the possibilities.

Congratulations poured in from politicians and public figures.

Swedish Prime Minister Fredrik Reinfeldt noted that the Scandinavian country could now look forward to a succession of female regents, a first in Swedish history.

"My warmest congratulations to Crown Princess Victoria, Prince Daniel and Sweden's new princess. It is a great day for the entire royal family and it is also a great day for Sweden," he said in a statement.

"With the birth of a new princess, the Kingdom of Sweden will in time enter a new era of queens," he said.