From French Joséphine, a feminine equivalent of Joseph formed with the diminutive suffix -ine. It is now widely used in the English-speaking world. Notable bearers have included the British social reformer Josephine Butler (1828–1906) and the American-born French dancer and singer Josephine Baker (1906–75).
Irish: Americanized form of Ó Muirgheasa ‘descendant of Muirgheas’, a personal name apparently derived from muir ‘sea’ + geas ‘taboo’, ‘prohibition’. However, according to MacLysaght, this surname is also derived from the Norman name de Marisco.