Rahab m.n. (Hebrew: רַהַב, Modern Rahav, Tiberian Rahaḇ ; "blusterer") is used in the Hebrew Bible to indicate rage, fierceness, insolence, pride. Rahab is the emblematic name of Egypt and is also spoken of with the sea. In medieval Jewish folklore, Rahab is a mythical sea monster.
Thou [Jehovah] art ruler over the pride of the sea, In the lifting up of its billows Thou dost restrain them. Thou hast bruised Rahab (Egypt), as one wounded. With the arm of Thy strength Thou hast scattered Thine enemies. (Psalm 89:8–10)YLT
Creation Narratives in the Biblical Texts
Prior to the Medieval adoption of "Rahab," to mean demon or sea beast, the name also appears in Psalms: 104, Psalms 89; 5-12, as well as Job 38: 8-11 and Isaiah 51:9-10. Rahab, in these passages, take the meaning of primeval chaotic sea, multi-headed dragon or Leviathan. It can be assumed that long before Jewish mythos, the ancient Jews emulated the creation fables told by their predecessors. The Babylonians, for example, told of a thunder god, Marduk, and a Sea Beast, Tiamat, battling for supreme power over the other gods, in the Enûma Eliš. It can be speculated that these two characters in the Babylonian myth, are parallel to the creation stories found in the Biblical passages containing the name Rahab. 
Rahaḇ as insolence or pride
He divideth the sea with his power, and by his understanding he smiteth through the proud (rahaḇ). (Job 26:12)KJV
In mediaeval Jewish folklore, Rahab (noise, tumult, arrogance) is a mythical sea monster, a dragon of the waters, the "demonic angel of the sea". Rahab represents the primordial abyss, the water-dragon of darkness and chaos, comparable to Leviathan and Tiamat. Rahab later became a particular demon, inhabitant of the sea, especially associated with the Red Sea.
- The fifth Israeli Navy Dolphin class submarine is to be named Rahab.
- Legacy of Kain: Soul Reaver for the PlayStation, Rahab is one of Kain's vampire generals that evolved over millennia into a large swimming monster.
- Castlevania: Dawn of Sorrow for the Nintendo DS, features an underwater boss named Rahab.
- In Castlevania: Aria of Sorrow and in Castlevania: Portrait of Ruin, a weapon called Rahab's Frost (Rahab's Sword in Aria of Sorrow), which is "a dagger made from the fang of the water dragon Rahab" is found.
- In the arcade shooter, The Ocean Hunter, Rahab is also the final boss and main antagonist.
- John, Day (1985). God's Conflict with the Dragon and the Sea. Cambridge, MA: Cambridge University Press. ISBN 978-0-521-25600-1. LCCN 83021045. OCLC 614077481.
- Gesenius, Wilhelm; Robinson, Edward (trans.) (1844). A Hebrew and English lexicon of the Old Testament: including the Biblical Chaldee. Boston, MA: Crocker & Brewster. p. 976. LCCN 2006366085. OCLC 2805204.
- Strong, James (1980) . "Strong's Concordance: H7294". Strong's Concordance. Abingdon Press. ISBN 978-0-687-40032-4. LCCN 80019453. OCLC 59851471.
- Coogan, Michael D. (2014). The Old Testament: A Historical and Literary Introduction to Hebrew Scriptures. New York: Oxford University Press. pp. 34–40. ISBN 978-0-19-994661-7.
- Strong, James (1980) . "Strong's Concordance: H7293". Strong's Concordance. Abingdon Press. ISBN 978-0-687-40032-4. LCCN 80019453. OCLC 59851471.
- Simon, Maurice (trans.); Slotik, Israel W. (trans.) (1935). "Folio 74b". In Epstein, Isidore. Baba Bathra: chapters I - VI; translated into English with notes, glossary and indices. London, England: Soncino Press. OCLC 34847398.
From this it may be inferred that the name of the angel of the sea was Rahab. And had not the waters covered him no creature could have stood his [foul] odour