Search gender: all male female Natsumio Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: natsumio Katakana: ナツミオ 0 Kanji: 夏澪 Meaning: 夏Summer. It is one of the four seasons. Big. Prosperous. The name of a dynasty or country in China. China's own name. 澪Waterway. A channel for small boats. A streak of water flow. Bubbles or streaks of water left behind after a ship has passed. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Natsumio Boy Name Meaning, Kanji Variations.