It's a japanese name, meaning "lightning,thunder". Isn't that cool!

Raiden (also Raijen), /RYE DEN/ is made from the Japanese elements rai meaning "thunder" and jin meaning "spirit; god." It was the name of a Japanese thunder deity. In current use in English, it is most often pronounced /RAY den/ and is getting popular as another name in the Jayden/Brayden/Caden continuum.
See Also: Raidon, Rhedyn, Reidyn

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