title_body: International Auxiliary Language created by a Japanese person
upvoted_answer: Assuming that the OP misremembered a few facts, the language may be Babm, invented by the Japanese philosopher Rikichi [Fuishiki] Okamoto (1885–1963) and first published in 1962. It uses the Latin script as a syllabary (which is not the same thing as using a latinate vocabulary) and has "some degree of analytic inflection".