Search gender: all male female 芥 Japanese Girl Names Variations. 1 names found. gender: all male female Name: kaika Katakana: カイカ 0 Kanji: 芥夏 Meaning: 芥Mustard 夏Summer. It is one of the four seasons. Big. Prosperous. The name of a dynasty or country in China. China's own name. You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > 芥 Japanese Girl Names Variations.