Search gender: all male female ハッセイ Japanese Names Variations. 1 names found. gender: all male female Name: hassei Katakana: ハッセイ 0 Kanji: 八誠 Meaning: 八Eight. Eighth. Kanji character for the number 8 (eight). A number one more than seven. A large number of people. It is said to be a lucky number because of its shape. 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 > ハッセイ Japanese Names Variations.