Search gender: all male female Sennen Boy Name Meaning, Kanji Variations. 1 names found. gender: all male female Name: sennen Katakana: センネン 0 Kanji: 千年 Meaning: 千Thousand. Kanji character for the number 1000 (thousand).A unit of number. A large number. Many. Various appearances. 年Year. A unit of measurement of time, the normal year is 365 days. A year. Age. Old age. Grains. Seasons. You can save your favorite names with NAZUKE PON > About Japanese Names > Search For Japanese Names > Sennen Boy Name Meaning, Kanji Variations.