Mariano \m(a)-ria-no\ as a boy's name is pronounced mahr-ee-AHN-oh. It is of Spanish and Latin origin, and the meaning of Mariano is "manly". Also possibly related to Mars; a masculine variant of Marie. Marion, the English form (Marian for girls) was the given name of John Wayne, but is rarely used for American boys today. Baseball players Mariano Duncan, Mariano Rivera.
For more information, see also the related name Mario.