Search gender: all male female Seisui Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: seisui Katakana: セイスイ 0 Kanji: 青水 Meaning: 青Blue. A general term for blue, such as indigo and navy blue. A metaphor for youthfulness. Immaturity. 水Water. Something liquid. Sea, river, swamp, lake, spring, etc. To work with water. To moisten. To soak in. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Seisui Boy Name Meaning, Kanji Variations.