There are at least four different men in the Bible named Enoch (Genesis 4:17; 5:18; 25:4; 46:9). We should note that, in Genesis 25:4 and Genesis 46:9, the NIV gives the name “Hanok,” while some other translations, such as the Darby translation, give the name “Enoch” instead. In both verses, the name “Hanok” is from the same Hebrew word translated “Enoch” in Genesis 4:17 and Genesis 5:18. Other translations say “Hanoch” or “Henoch.” The only difference is one of English spelling.
It is only the Enoch mentioned in Genesis 5:18 that the Bible gives any significant information about. This Enoch was the great-great-great-great-grandson of Adam. “And Enoch walked with God after he begat Methuselah three hundred years, and begat sons and daughters: And all the days of Enoch were three hundred sixty and five years: And Enoch walked with God: and he was not; for God took him.” Genesis 5:22–24
“By faith Enoch was translated that he should not see death; and was not found, because God had translated him: for before his translation he had this testimony, that he pleased God.” Hebrews 11:5
This being “taken away” is what Enoch is most famous for. Only two people in the Bible are said to have been chosen by God to escape death, Enoch and Elijah. Enoch appears to have been given this privilege due to being a man who walked faithfully with God (Genesis 5:24) and pleased God (Hebrews 11:5). The only biblically based answer as to why God tool Enoch is so that he could serve as one of the two witnesses, alongside Elijah, in the end times.
There are also three pseudepigraphal books using Enoch’s name, with 1 Enoch being the most well known, often referred to as the Book of Enoch. None of the pseudepigraphal books of Enoch were actually written by the biblical Enoch. However, since the biblical book of Jude quotes from 1 Enoch and attributes the quotation to the biblical Enoch (Jude 14), at least that one small prophecy is truly attributable to the biblical Enoch.