Siobhan rhymes with:
autobahn, autobon, agamemnon, aileron, alarcon, albashaun, amazon, antiphon, aragon, arbitron, argon, argonne, arton, autobahn, autobon, automaton, avalon, axon, babylon, betaseron, boron, capon, carillon, catchacan, celadon, cephalon, chapoton, christiaan, cimarron, comecon, crayon, d'aubuisson, dacron, digicon, dijon, distron, echelon, econ, emoticon, epsilon, erawan, ethicon, farrakhan, fenelon, germiston, greenspon, guslan, halon, hardymon, helicon, hexagon, hogan, huron, infotron, lexicon, liaison, lifson, littlejohn, logicon, magnetron, mahtan, marathon, memnon, meson, micron, midcon, monoszon, moron, narasimhan, neutron, nikon, nipon, nylon, oberon, octagon, oerlikon, olajuwon, oxdon, pantheon, paragon, parmesan, parthenon, pentagon, phenomenon, photon, pi-meson, pion, planecon, polygon, polysilicon, pompon, positron, proton, pylon, qian, radon, radovan, ragavan, reveron, saamstaan, semicon, shihan, simion, sirhan, slip-on, slobodan, symtron, technicon, telefon, teletron, tucson, upjohn, vanderlaan, videotron, walk-on, waylon, yukon
Siobhan sounds like:
saban, sabena, sabin, sabina, sabine, sabino, sabunuma, safian, saipan, sapien, sapone, saucepan, savanna, savannah, saviano, savin, savina, savini, savino, savion, savon, savona, saxophone, scavone, schaben, schiavone, schiavoni, schifano, schiffman, schipani, scipione, seven, sevin, shaven, shibanna, shiffman, shipman, shobana, shobanna, shoopman, shubin, sieben, siphon, sobin, sobon, sofian, sousaphone, sovine, soybean, spahn, spain, spam, span, spann, spano, spawn, speno, spin, spina, spine, spinney, spino, spiny, spohn, spoon, spun, subhuman, subminimum, subpoena, supan, supine, sven, syphon