Meaning of Nagisa. Japanese name. In Japanese, the name Nagisa means-shore.The name Nagisa originated as an Japanese name. The name Nagisa is most often used as a girl name or female name.Japanese Name Meaning-shore. Origin-Japan.n Japanese, the name Nagisa means-shore.The name Nagisa originated as an Japanese name. The name Nagisa is most often used as a girl name or female name. Japanese Name Meaning-shore.