In the anime and manga series "Demon Slayer: Kimetsu no Yaiba," the character Zenitsu Agatsuma wields a sword called the "Nichirin Blade." However, the sword itself doesn't have a specific individual name. The emphasis in the series is usually placed on the user's skills, techniques, and abilities rather than naming individual swords. Zenitsu's sword is depicted with a silver blade and a yellow hilt, matching his character design.