Search gender: all male female Masumu Girl Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: masumu Katakana: マスム 0 Kanji: 真清 Meaning: 真True. Truth, not falsehood. Nature as it is. True form. Innate. 清Clean. To be free from muck and dirt. Clean and righteous in mind and conduct. Refreshing. To put away. tidy up. To purify. Name of a Chinese dynasty. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Masumu Girl Name Meaning, Kanji Variations.