List of Famous people born on January 31st

Beatrice was the only surviving legitimate child of King Ferdinand I of Portugal and his wife, Leonor Teles. She became Queen consort of Castile by marriage to King John I of Castile. Following her father's death without a legitimate male heir, she claimed the Portuguese throne, but lost her claim to her uncle, who became King John I of Portugal, founder of the House of Aviz.

Baron Raimondo Franchetti has been the name of more than one Italian Baron, of the noble Franchetti family. The Franchettis were an Italian Jewish family who, from the 18th century onwards, were one of the wealthiest families in the Mediterranean. They were originally a Venetian family. The most famous member of the family named Baron Raimondo Franchetti lived from 1889 until his death in an airplane crash in the Egyptian desert in 1935.

Stewart Lee Udall was an American politician and later, a federal government official. After serving three terms as a congressman from Arizona, he served as Secretary of the Interior from 1961 to 1969, under presidents John F. Kennedy and Lyndon B. Johnson.

Guy Georges Vĩnh San, also Prince Nguyễn Phúc Bảo Ngọc, is a son of Vietnamese Emperor Duy Tan. Since 2017, he has been the head of the House of Nguyen Phuc, Vietnam's former imperial house. Georges lives in France.

Juraj V Zrinski was a Croatian Ban (viceroy), warrior and member of the Zrinski noble family.