Search gender: all male female Masadai Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: masadai Katakana: マサダイ 0 Kanji: 昌大 Meaning: 昌Thriving. vigorous. Explicit. bright. good. beautiful. Splendid. Sunlight. 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. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Masadai Name Meaning, Kanji Variations.