hiː tˈʊk hɪz nˈeɪm fɹʌmðə sˈoʊmə mˈɪkjʊɹɹˌɪjə, ɐ ʃˈuːn kəntɹˈoʊld baɪ ˈaɪz ʃɹˈaɪn ɪn wʌt ɪz nˈaʊ nɔːɹθwˈɛst tʃˈiːbə pɹˈiːfɛktʃɚ, wˌɪtʃ səplˈaɪd hˈɔːɹsᵻz tə ðə ʃɹˈaɪn ænd ðɪ ɪmpˈɪɹiəl hˈaʊshoʊld.
He took his name from the Sōma Mikuriya, a shōen controlled by Ise Shrine in what is now northwest Chiba Prefecture, which supplied horses to the shrine and the Imperial household.