Are you asking about Genesis 1 or Genesis 2? They are two different stories that have different authors, different orders of creation and use different words for God (Elohim vs Yaweh.) They are similar but certainly not the same, so you'd have to choose which one you're talking about.
Eloh is the straightforward Hebrew word for "god," passed down through its ancestral Semitic languages in the Afroasiatic language family. It's cognate with the Arabic word
allah--now capitalized like "God" in English and other languages with a dual-case alphabet, since the Arabs have become monotheistic.
Elohim, "gods," is simply
eloh with the common plural inflection
-im.
The origin of YHWH, the
tetragrammaton, is not so clear. Apparently this new singular god did not wish to be referred to by an old everyday word that had been used for centuries to mean any god from a whole pack of gods. So the Hebrews (who were now "Jews" even though they're not all from the tribe of Judah) invented a new name for him. It could be a word that means "he creates," but some scholars say it is from God's Popeye-like assertion, "I am that I am." In the former case the correct pronunciation is indeed
Yahweh but except in textbooks and the litugy Hebrew is written without vowels like all languages that use an
abjad, so we can't be sure which is the correct origin.
It's been established by the priesthood that even though God likes his new name, he doesn't want anybody to speak it out loud. To the point that if he ever hears it he will smite the speaker. Modern scholars, both Jewish and Gentile, have standardized on the spelling
Yahweh, which therefore is spoken out loud all over the world many times per day. Since there is no record of anyone being struck by lightning for blasphemy, this argues powerfully against the assertion that this is the correct pronunciation.
The Romans transliterated it as
Jehovah, since their
alphabet requires the use of vowels. J and V are semivowels so this was pronounced YE-HO-WAH. Apparently that's not right either!