Cognomen Joir (Joir 
, Gioire 
) , around the world, is a very rare family name. The cognomen Joir is habitual in Singapore, where it is a very rare surname, Venezuela, and Brazil, where it is an extremely rare surname. Much more prevalently, Joir is the forename as well as the last name.
Ali, Soares, Araujo, Coelho, Borges, Junior, Martins, Miranda, Santana, Almeida, Andrade, Cantero, Barbosa, Batista, Pereira, Ribeiro, Silveira, Teixeira, Ferreira, Oliveira, Conceicao, Rodrigues, Santos, Moraes, Uddin, Filho, Rio, Cruz, Brum, Rosa, Dias, Lima, Neto, Vale, Silva, Souza, Goncalves, Alves, Brito, Paula, Pinto, Rocha, Gomes, Lemos, Jesus, Neves, Nunes, Viana, Costa, and Quintilhano