The Civil Writer Magazine

The word Eponymous means "named after its central character or creator". God is an example of an eponymous word taken from a (real or fictitious) God. The word Kleenex for example is an eponymous word, taken from a brand of facial tissues, yet the word is used today to refer to facial tissues of any brand. When such terms are adopted for general use they tend to become eponymous.

God is an eponymous word meaning a being perfect in power, wisdom, and goodness who is worshipped as creator and ruler of the universe. Throughout recorded history, we can count anywhere from 8,000–12,000 beings considered as gods who have been worshiped.

The question is, which "god" used the identity first, Shiva, Jehovah, Allah, Jesus or another? If you ask any religion their God came first. As an example, in Greek mythology, the primordial deities, or Protogenoi as they are sometimes known, are the first gods and goddesses born using the the eponymous name God.

The Abrahamic Gods are considered the first

to use the eponymous name "God" by all three religions Judaism, Christianity and Islam but ancient Persia, Zoroastrianism the world's oldest surviving religions, with teachings older than Buddhism, older than Judaism, and far older than Christianity or Islam presented their deity as a "God". Note that the Bible says, “In the beginning God created the heavens and the earth” (Genesis 1:1). ... But Genesis didn't create the word God first.