Search gender: all male female オオマコト Japanese Names Variations. 1 names found. gender: all male female Name: omakoto Katakana: オオマコト 0 Kanji: 大誠 Meaning: 大Big. Large. Large in number or quantity. Greatly. Valuable. Important. Excellent. Splendid. Very much. Much. (Power or force) strong. long time. To be high in rank or position. 誠True. A heart without lies and falsehoods. Sincerity. Truly. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > オオマコト Japanese Names Variations.