Marinho is a Portuguese diminutive of Mario. Mario is a Spanish and Italian variant of Marius. Marius is derived from the Latin meaning "dedicated to Mars". Mars was the Roman god of war, known to the Greeks as god Ares. It is also the fourth planet in the solar system. Some sources also suggest that Marius comes from the Latin word for "male". It is a popular masculine given name in some European languages, in the United States its usage is rather rare.