ウポポイ

• upopo song sung in a group
• + o have many of
• + i place

Proponent: zenibako_trek（小樽銭函地名歴史研究会） (zenibako_trek (Otaru Zenibako Place-Name and History Society))

The article states that upopoy is in no Ainu dictionary and is a coined word, while upopo 'song' exists: a song sung in rounds while clapping, analysed u-po-po with the prefix u- 'each other' and po as the sound of the clap. Read as a place name of the ordinary o-i shape, it says 'place where there are many songs', which fits a hall where song programmes are performed.