The research of this article is related to mythology and history in terms of place and name. Whether Kayomarth is the first human or the first shahriyar, and what his name means is the subject of this article. The method of working in a library and based on the sources, the subject has been investigated and the following results have been obtained With the formation of the Zoroastrian myth, Kayomarth appeared and is considered an Iranian phenomenon. According to Avesta resources, Kayomarth is the sixth creation of Ormazd, in Middle Persian sources, Kayomarth is the archetype of man and the first human. Some sources of the Islamic period have considered Kayomarth as the first human, and others have mentioned him as the first king. Two points worth pondering about Kayomarth: one is that he is the first human and cannot be the first king; And the other thing is that the name Kayomarth shows two opposite dimensions,life and death, which can be an emphasis on the fact that good and bad are mixed inside a person; But both are unique in their creative power; Also, these two dimensions of "life and death", the mino aspect of the divine soul, gay and death, express extinction. . In this name, life precedes death. Just as in the name of the inheritance of life, which is a symbol of good in the myth, death, which is a symbol of evil and the devil, prevails, at the end of the world, good will prevail over evil. The cause of the victory of good over evil is man.