Firstly, I know very little about Ninus. Secondly, he was known as Ninus by Greek historians not the Sumerians. And thirdly, Semiramis has nothing to do with Nimrod (they two lived at least a millenium apart!)
Firstly, I don't get how you thought dragging Semiramis int this would clear anything up.
Now, assuming that Ninus is Nimrod, the way in which that assumption explains what is otherwise inexplicable in the statements of ancient history greatly confirms the truth of that assumption itself. Ninus is said to have been the son of Belus or Bel, and Bel is said to have been the founder of Babylon. If Ninus was in reality the first king of Babylon, how could Belus or Bel, his father, be said to be the founder of it? Both might very well be, as will appear if we consider who was Bel, and what we can trace of his doings. If Ninus was Nimrod, who was the historical Bel? He must have been Cush; for "Cush begat Nimrod" (Gen 10:8); and Cush is generally represented as having been a ringleader in the great apostacy. * But again, Cush, as the son of Ham, was Her-mes or Mercury; for Hermes is just an Egyptian synonym for the "son of Ham." **
* See GREGORIUS TURONENSIS, De rerum Franc. Gregory attributes to Cush what was said more generally to have befallen his son; but his statement shows the belief in his day, which is amply confirmed from other sources, that Cush had a pre-eminent share in leading mankind away from the true worship of God.
** The composition of Her-mes is, first, from "Her," which, in Chaldee, is synonymous with Ham, or Khem, "the burnt one." As "her" also, like Ham, signified "The hot or burning one," this name formed a foundation for covertly identifying Ham with the "Sun," and so deifying the great patriarch, after whose name the land of Egypt was called, in connection with the sun. Khem, or Ham, in his own name was openly worshipped in later ages in the land of Ham (BUNSEN); but this would have been too daring at first. By means of "Her," the synonym, however, the way was paved for this. "Her" is the name of Horus, who is identified with the sun (BUNSEN), which shows the real etymology of the name to be from the verb to which I have traced it. Then, secondly, "Mes," is from Mesheh (or, without the last radical, which is omissible), Mesh, "to draw forth." In Egyptian, we have Ms in the sense of "to bring forth" (BUNSEN, Hieroglyphical Signs), which is evidently a different form of the same word. In the passive sense, also, we find Ms used (BUNSEN, Vocabulary). The radical meaning of Mesheh in Stockii Lexicon, is given in Latin "Extraxit," and our English word "extraction," as applied to birth or descent, shows that there is a connection between the generic meaning of this word and birth. This derivation will be found to explain the meaning of the names of the Egyptian kings, Ramesses and Thothmes, the former evidently being "The son of Ra," or the Sun; the latter in like manner, being "The son of Thoth." For the very same reason Her-mes is the "Son of Her, or Ham," the burnt one--that is, Cush.
Now, Hermes was the great original prophet of idolatry; for he was recognised by the pagans as the author of their religious rites, and the interpreter of the gods. The distinguished Gesenius identifies him with the Babylonian Nebo, as the prophetic god; and a statement of Hyginus shows that he was known as the grand agent in that movement which produced the division of tongues. His words are these: "For many ages men lived under the government of Jove [evidently not the Roman Jupiter, but the Jehovah of the Hebrews], without cities and without laws, and all speaking one language. But after that Mercury interpreted the speeches of men (whence an interpreter is called Hermeneutes), the same individual distributed the nations. Then discord began." *
* HYGINUS, Fab. Phoroneus is represented as king at this time.
Here there is a manifest enigma. How could Mercury or Hermes have any need to interpret the speeches of mankind when they "all spake one language"? To find out the meaning of this, we must go to the language of the Mysteries. Peresh, in Chaldee, signifies "to interpret"; but was pronounced by old Egyptians and by Greeks, and often by the Chaldees themselves, in the same way as "Peres," to "divide." Mercury, then, or Hermes, or Cush, "the son of Ham," was the "DIVIDER of the speeches of men." He, it would seem, had been the ringleader in the scheme for building the great city and tower of Babel; and, as the well known title of Hermes,--"the interpreter of the gods," would indicate, had encouraged them, in the name of God, to proceed in their presumptuous enterprise, and so had caused the language of men to be divided, and themselves to be scattered abroad on the face of the earth. Now look at the name of Belus or Bel, given to the father of Ninus, or Nimrod, in connection with this. While the Greek name Belus represented both the Baal and Bel of the Chaldees, these were nevertheless two entirely distinct titles. These titles were both alike often given to the same god, but they had totally different meanings. Baal, as we have already seen, signified "The Lord"; but Bel signified "The Confounder." When, then, we read that Belus, the father of Ninus, was he that built or founded Babylon, can there be a doubt, in what sense it was that the title of Belus was given to him? It must have been in the sense of Bel the "Confounder." And to this meaning of the name of the Babylonian Bel, there is a very distinct allusion in Jeremiah 50:2, where it is said "Bel is confounded," that is, "The Confounder is brought to confusion." That Cush was known to Pagan antiquity under the very character of Bel, "The Confounder," a statement of Ovid very clearly proves. The statement to which I refer is that in which Janus "the god of gods," * from whom all the other gods had their origin, is made to say of himself: "The ancients...called me Chaos."
* Janus was so called in the most ancient hymns of the Salii. (MACROB, Saturn.)
Now, first this decisively shows that Chaos was known not merely as a state of confusion, but as the "god of Confusion." But, secondly, who that is at all acquainted with the laws of Chaldaic pronunciation, does not know that Chaos is just one of the established forms of the name of Chus or Cush? * Then, look at the symbol of Janus, ** (see Fig. 7) whom "the ancients called Chaos," and it will be seen how exactly it tallies with the doings of Cush, when he is identified with Bel, "The Confounder." That symbol is a club; and the name of "a club" in Chaldee comes from the very word which signifies "to break in pieces, or scatter abroad." ***
* The name of Cush is also Khus, for sh frequently passes in Chaldee into s; and Khus, in pronunciation, legitimately becomes Khawos, or, without the digamma, Khaos.
** From Sir WM. BETHAM'S Etruscan Literature and Antiquities Investigated, 1842. The Etruscan name on the reverse of a medal--Bel-athri, "Lord of spies," is probably given to Janus, in allusion to his well known title "Janus Tuens," which may be rendered "Janus the Seer," or "All-seeing Janus."
*** In Proverbs 25:18, a maul or club is "Mephaitz." In Jeremiah 51:20, the same word, without the Jod, is evidently used for a club (though, in our version, it is rendered battle-axe); for the use of it is not to cut asunder, but to "break in pieces." See the whole passage.
He who caused the confusion of tongues was he who "broke" the previously united earth (Gen 11:1) "in pieces," and "scattered" the fragments abroad. How significant, then, as a symbol, is the club, as commemorating the work of Cush, as Bel, the "Confounder"? And that significance will be all the more apparent when the reader turns to the Hebrew of Genesis 11:9, and finds that the very word from which a club derives its name is that which is employed when it is said, that in consequence of the confusion of tongues, the children of men were "scattered abroad on the face of all the earth." The word there used for scattering abroad is Hephaitz, which, in the Greek form becomes Hephaizt, * and hence the origin of the well known but little understood name of Hephaistos, as applied to Vulcan, "The father of the gods." **
* There are many instances of a similar change. Thus Botzra becomes in Greek, Bostra; and Mitzraim, Mestraim.
** Vulcan, in the classical Pantheon, had not commonly so high a place, but in Egypt Hephaistos, or Vulcan, was called "Father of the gods." (AMMIANUS MARCELLINUS)
Hephaistos is the name of the ringleader in the first rebellion, as "The Scatterer abroad," as Bel is the name of the same individual as the "Confounder of tongues."
The Two Babylons: The Child in Assyria