Maori tahi

← Proto-Austronesian *isa (inherited)

← Proto-Austronesian *əsa (mention)

← Proto-Austronesian *asa (mention)

← Proto-Polynesian *tasi (inherited)

← Proto-Malayo-Polynesian *isa (inherited)

← Proto-Malayo-Polynesian *əsa (mention)

→ 'Are'are tai (cognate)

→ Cebuano usa (cognate)

→ Rapa Nui tahi (cognate)