Been reading this long thread and would like to add my thoughts regarding the use of names in English (my mother was native born Japanese and my father was a career US Army NCO).
Having spent my youth from 7-9 yrs old in Japan (Camp Drake and Yokohama Naval base, 1969-1971) my guess regarding the use of names spelled in English would have to do with the early westernization of Japan beginning in the mid 1800s upward. I never learned to read Japanese but I do remember some of the larger Japanese corporations displaying signs in English on their corporate buildings back in the early 70s (Sony was one).
Early Westernization & Modernization in Japan 1868-1900 | JapanVisitor Japan Travel Guide


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