Surname was found after research on ancestry,com, see attached SSDI for Toraichi Hayashi which matches dates on this headstone.
U.S., Social Security Death Index, 1935-Current about Toraichi Hayashi
Name: Toraichi Hayashi
SSN:
Last Residence: Hawaii
Born: 29 Jun 1890
Died: Jul 1962
State (Year) SSN issued: Hawaii (Before 1951)