蝦夷方言藻汐草

Sipuya is retained: eleven corpus records in the nam-kuzuno collection use this spelling, including sioynane sipuya kurkasi with a Japanese translation referring to sacred smoke. This supports the recorded シブヤ without silently substituting supuya. Tamura and Nakagawa supply supuya as a related smoke word. The corpus metadata date the sample recording to 1986; these later prayer texts do not prove eighteenth-century pronunciation or independent evidence from eleven speakers.