永祚 ながそ family or surname Also 永祚: えいそ Eiso era (989.8.8-990.11.7) えいそ Eiso 永祚ながそ family or surname English JMnedict (Japanese names) 1 Nagaso 漢字 kanji used 永 eternity, long 5画 祚 imperial throne, happiness 10画