Stockholm - The newest addition to Sweden's royal family will be known as Prince Alexander, King Carl XVI Gustaf announced Thursday at a meeting with the cabinet.
His other names are Erik, Hubertus and Bertil, and his title will be Duke of Sodermanland, the king said.
The baby boy, born Tuesday, is fifth in line to the throne.
His parents are Prince Carl Philip and his wife, Princess Sofia, who married in June 2015.
On marrying the prince, the former model was granted the title Princess, Duchess of Varmland.
The newborn boy is King Carl Gustaf and Queen Silvia's fifth grandchild.
"It is great fun that the stork has been so active this year in the (royal) family Bernadotte," the king said.
Carl Philip is the second of the king and queen's three children.
Their oldest daughter is Crown Princess Victoria, who also attended Thursday's meeting, and their youngest daughter is Princess Madeleine.
Erik is the baby's maternal grandfather and an old royal name, while Hubertus is one of the names of his paternal grandfather, the king.
The baby is also named after the king's uncle, Prince Bertil, who died in 1997, and who was close to Carl Philip and his siblings.
Sweden in 1980 changed the order of succession so that the monarch's eldest heir, regardless of gender, inherits the throne.