With a little bit of digging on ancestry.com I have been able to determine the surname is Hara, see attached census record from 1930 which mentions both Buichi and Kanayo.
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BillionGraves.com record for Momokazu Hara (6 January 1931 - 7 January 1931), BillionGraves Record Hanapepe Japanese Cemetery, Hanapepe, Kauai, Hawaii, United States, North America