Sei is a name of Japanese origin, often used for both boys and girls. In Japanese, the name can mean "pure," "clear," or "life," depending on the kanji characters used. It is a relatively common name in Japan and can also be found in other cultures with different meanings. In addition to its use as a personal name, Sei is associated with various cultural references, including Sei Shonagon, a famous Japanese author and court lady from the Heian period. The name is also linked to the concept of Sei in traditional Japanese philosophy, which emphasizes harmony and balance in life.