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Their names are Fūtarō (Fuutarou) and Raiha. The gods are Fūjin and Raijin. Is there some Japanese article that possibly talks about this?

BCLC
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1 Answers1

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According to this, your guess seems to be correct.

名前の由来は風神雷神の雷神で、風太郎と対になっている。

(The origin of the name is Raijin from Fujin&Raijin, pairing with Futaro.)

sundowner
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    Same with their dad? https://anime.stackexchange.com/questions/66807/is-the-dad-isanari-of-the-uesugi-siblings-f%c5%abtar%c5%8d-and-raiha-named-after-izanami – BCLC May 16 '22 at 08:14