Saraph: a man's name in the family records of Judah, spelled exactly like the Hebrew word for a burning one, the snake whose bite burns
Saraph is a person, not a creature. He appears once in the whole Bible, in the long family record of the tribe of Judah in 1 Chronicles 4, among the descendants of Shelah, one of Judah's sons. He is listed next to a man named Joash, and the short remark attached to the pair of them is read either as "who had the dominion in Moab" or as "who married into Moab," because the Hebrew verb behind it covers both taking possession of something and taking a wife. Nothing else is told about him: no story, no deed, only his place in the list, which the writer closes by noting that these records are ancient.
The name itself is an ordinary Hebrew noun, שָׂרָף, meaning "a burning one." That noun is the Old Testament's word for the venomous desert snakes remembered for how much their bite burns, the ones that struck the people in the wilderness, and it is also the word Isaiah uses for the six-winged beings who stand above God's throne calling out his holiness. Behind both stands the plain everyday verb שָׂרַף, "to burn." So the man's name means something close to "the burning one" or "the fiery one."
Naming a child after an animal, even a dangerous one, was ordinary in ancient Israel rather than sinister. Another man in the Bible is simply called Nahash, which is the everyday Hebrew word for a snake, and other familiar biblical names are built the same way: Deborah means "bee," Rachel means "ewe," and Jonah means "dove." A name like Saraph made no claim about the man's character and said nothing at all about heavenly beings; it worked much the way names such as Wolf and Fox have worked in later languages.