Istória Wau Gau (Kairui: fahi ulun) iha relasaun ho istória kona-ba Mau Lau ne'ebé sa'e husi Seu Baru iha Ossu no nakfila ba família ida molok nia rai hela iha Wailili no nakfila fali ba bee-matan. Wau Gau mós sa'e husi Seu Baru no la'o rai buka hela fatin foun ida. Ikus mai nia mós nakfila ba bee-matan no fila ba rai no fó naran ba área ne'ebé ohin loron bolu Wau Kau (Waima'a ba Wau Gau).
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The story of Wau Gau (Kairui: 'pig's head') is connected to the story of Mau Lau which left Seu Baru in Ossu, morphed into a family before settling in the Wailili area and morphing back into a spring. Similarly Wau Gau left Seu Baru and travelled across country in search of a new home. Eventually the spring morphed back into the ground giving its name to the area of Wau Kau (the Waima'a rendering of Wau Gau).