Search gender: all male female セイジョウ Japanese Boy Names Variations. 1 names found. gender: all male female Name: seijo Katakana: セイジョウ 1 Kanji: 星城 Meaning: 星A star. A star shining in the night sky. Celestial bodies. The flow of years, months, and days. An important person. A landmark. Signs. Aims. 城Castle You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > セイジョウ Japanese Boy Names Variations.