Spanish and Portuguese form of
Ramirus, a Latinized form of a Visigothic name derived from the Germanic elements
ragin "advice" and
meri "famous". Saint Ramirus was a 6th-century prior of the Saint Claudius Monastery in Leon. He and several others were executed by the Arian Visigoths, who opposed orthodox Christianity. This name was subsequently borne by kings of León, Asturias and Aragon.