According to Fujimoto Tatsuki, the author of Chainsaw Man, the name DENJI comes from a Japanese word that means an angel.
An angel is TENSHI in Japanese.

Denji is a character who transforms into a chainsaw and it’s like a battery. Battery says DENCHI in Japanese. So the author added voiced sounds to the word TENSHI and made it DENJI.

That’s the origin of Denji’s name!
He became a demon, but his name originates from an angel who fights demons.
The manga that gave an effect on Chainsaw Man
Among Japanese fans, it has been guessed that Denji’s name was derived from a manga titled “ABARA” by Nihei Tsutomu. The name of the main character of ABARA is Kudo Denji and the author Fujimoto told that he got an inspiration from the manga when he started to draw Chainsaw Man.
If you want to know about other characters and Chainsaw Man trivia, check the link below😉
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