1 The meaning of Saito is purification wisteria . 2  The most common Kanji used in the name Saito is 斎藤. 3  The name meaning could vary if alternative Kanji (Japanese characters) are used.4  Saito is a Japanese last name.aito-Meaning of Saito. 1  The meaning of Saito is purification wisteria . 2  The most common Kanji used in the name Saito is 斎藤. 3  The name meaning could vary if alternative Kanji (Japanese characters) are used.