Fromguerra(“war”) +-er(relational suffix) or a Vulgar Latin*werrārius.
guerrer (feminineguerrera,masculine pluralguerrers,feminine pluralguerreres)
guerrer m (pluralguerrers,feminineguerrera)
guerreroblique singular, m (oblique pluralguerrers,nominative singularguerrers,nominative pluralguerrer)