Reis is a common surname in the Portuguese language, namely in Portugal and Brazil. It was originally a Christian devotional family name of the Middle Ages, probably due to the Portuguese name for the Biblical Magi, the Reis Magos (the Magi Kings). Sometimes the surname is dos Reis (of the Kings). The Reis surname does not denote a single genealogical origin and there are many different families bearing that surname. The Reis etymology is probably from the Latin Rex ("King"), and it is noticeable that it has relations with the German Reich ("Kingdom, Empire"), and the Dutch Rijk (also "Kingdom, Empire"), the Germanic names Rick, Rich, Richard, etc.
Reis is also a common surname in the German language (where its alternative meaning is "rice"), a historically famous epithet derived from military rank in Turkey (e.g., Piri Reis), and was also used by some European Jews.
It is a name associated with a great number of different people:
- Alves dos Reis, Portuguese financial criminal
- António Reis, Portuguese film director
- Reis (footballer), nickname of Deivdy Reis Marques do Nascimento, Brazilian footballer born in 1988
- Gabriel Reis, Brazilian water polo player
- Johann Philipp Reis, German scientist and inventor
- John Reis, American musician
- Jonathan Reis, Football player
- Matt Reis, American football player
- Micaela Reis, Angolan model, Top 10 at the 2007 Miss Universe pageant and 1st runner-up at Miss World 2007
- Michelle Monique Reis, Hong Kong actress
- Nando Reis, Brazilian rock bass/acoustic guitarist
- Nicolau dos Reis Lobato, East Timorese politician
- Ricardo Reis, one of the Portuguese poet Fernando Pessoa's heteronyms
- Roberto Esser dos Reis, Brazilian ichthyologist
- Rodrigo Junqueira dos Reis, Brazilian actor
- Ron Reis, American professional wrestler
- The real (plural reais) is the present currency of Brazil.
- The Spanish real (plural reales) was a currency of Spain.
- The Portuguese real (plural reis or réis) was a currency of Portugal and Brazil.
The rank Reis Pasha referred to an Admiral, while the Kapudan Pasha (akin to Grand Admiral; literally "Captain Pasha") title referred to the commander-in-chief of the Ottoman Navy fleet.
There are several places around the world named Reis:
- Dirce Reis, São Paulo, Brazil
- Angra dos Reis, Rio de Janeiro, Brazil
- Reis Township, Polk County, Minnesota, U.S.
- Reis Magos, former name of Nova Almeida, Espírito Santo, Brazil
- Reis Magos, a river at whose mouth the town of Nova Almeida stands
- Caldas de Reis, Portugal