Search gender: all male female Okuma Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: okuma Katakana: オクマ 0 Kanji: 億磨 Meaning: 億Billion. The name of a number, ten thousand times ten thousand. The number is very large. To measure. To think over. to be calm. 磨Polishing. Make it beautiful with care. To work hard at something or study. To wear away. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Okuma Boy Name Meaning, Kanji Variations.