Search gender: all male female Tonga Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: tonga Katakana: トンガ 0 Kanji: 惇河 Meaning: 惇Humanity. Sincerity. Caring. Kindness. 河River You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Tonga Name Meaning, Kanji Variations.