Ralph Lauren is a proper name used as a brand identity; when referring to the designer, expect a two-element surname-style articulation. In everyday use, it is spoken as a proper noun with attention to the soft A in Ralph and the rhotic, non-syllabic -er in Lauren, forming a smooth, two-syllable or three-syllable sequence depending on accent. The phrase functions as a brand identifier in fashion contexts and media discussions.
Full pronunciation guide