It is said that the name 'Tenman' was derived from the name 'Soramitsu Dai Jizai Tenjin' given name as a deity following the death of Michizane, which was itself derived from the saying that 'The vengeful spirit of Michizane became the god of thunder and filled the sky.'
「天満」の名は、道真が死後に送られた神号の「天満（そらみつ）大自在天神」から来たといわれ、「道真の怨霊が雷神となり、それが天に満ちた」ことがその由来という。