Tradition: Japanese Mythology
Alternative Names: 波兎, 波に兎, 波乗り兎, Hato, Wave Rabbit, Rabbit Riding the Waves
Category: Rabbit
The Myth
Nami Usagi, meaning “wave rabbit,” is a traditional Japanese artistic motif depicting a rabbit leaping across waves. Also known as Nami ni Usagi or Naminori Usagi, the design became established during the early modern period and has been used as an auspicious decoration on shrine and temple carvings, artworks, household objects, and architectural ornaments. Its origins are uncertain, and several interpretations have developed over time.
One explanation connects the motif with protection against fire. Rabbits riding waves were frequently depicted on roof ornaments, storehouse decorations, and clothing worn during fires, suggesting that the design may have been intended to ward off flames. In Miyoshi, Hiroshima Prefecture, a traditional ceremony known as Ushi Kuyō involves placing a decorated saddle called Tama Usagi on a cow used for puddling rice fields. Its rabbit-and-wave design has been associated with the rabbit as a deity of fertility and agricultural abundance.
Art historians commonly connect the motif to the Noh play Chikubushima. In the play, a courtier travelling across Lake Biwa describes the beauty of trees reflected in the water and moonlight shimmering across the lake, comparing the scene to a rabbit running over the waves. The image refers to the Jade Rabbit associated with the Moon, whose reflection appears to move across the water. The poet Yosa Buson similarly compared moonlight on Lake Suwa to a rabbit crossing the lake. These poetic images may have inspired artists to represent the moonlit waves as a rabbit leaping across them.
Other interpretations link the motif to the myth of the White Hare of Inaba, in which a hare crosses the backs of crocodiles or wani. The scholar Nishida Naoyoshi suggested that the original design may have depicted a rabbit crossing the backs of these creatures before gradually changing into a rabbit riding waves. A further connection appears in a shrine tradition from Yazu, Tottori Prefecture, concerning Dōso Shirousagi Daimyōjin, or White Hare Shrine. According to its origin story, a white hare guided the sun goddess Amaterasu to Mount Reisen and was subsequently worshipped as a local guardian deity. The hare was also regarded as the sacred manifestation of Tsukuyomi, the Moon deity, and rabbit-and-wave carvings found at shrines throughout the region may be connected with this tradition.
Sources
“Namiusagi.” 新版TYZ 妖怪図鑑 (New TYZ Yokai Encyclopedia). https://tyz-yokai.blog.jp/archives/1084424021.html