Search gender: all male female ウコ Japanese Girl Names Variations. 2 names found. gender: all male female Name: uko Katakana: ウコ 0 Kanji: 卯子 Meaning: 卯Rabbit. Fourth of the twelve signs of the Chinese zodiac. As the hour of the rabbit, 5:00 to 7:00 a.m. or 6:00 to 8:00 a.m. The direction of the east. 子Children Name: uko Katakana: ウコ 0 Kanji: うこ Meaning: う こ You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > ウコ Japanese Girl Names Variations.