2 syllables:
bein', beinn, be in, breon, cleon, creon, deehan, eon, feehan, fee in, fleein, free in, grian, heon, he in, ian, jian, keehan, key in, kian, knee in, korean, leeann, leeanne, lee in, meehan, meighan, me in, paean, peahen, peon, plea in, pleon, preon, prian, quyen, raeann, rijn, sea in, see in, sheahan, sheehan, she in, sie in, spion, staurion, stijn, teahan, tea in, teehan, thee in, theon, three in, tree in, treon, trion, vian, viii in, vii in, we in, wie in

3 syllables:
abziehen, achaean, achean, aegean, agree in, akiane, anniyan, antaean, asean, astraean, aufziehen, ausziehen, bestehen, boolean, broad-bean, carnian, cevian, chaldaean, chatriyan, crimean, cumaean, debris in, decree in, degree in, durchziehen, egean, fujian, graafian, huxleian, idaean, illiyin, judaean, kykeon, l.l.bean, lethean, lezghian, linnaean, mandaean, mannaean, martijn, mcgeean, mckeon, mckeone, mercian, nicaean, nymphean, ossean, ozean, paphian, patreon, plebeian, pompeian, priscian, protean, pygmaean, riffian, rowleian, ruffian, rugbeian, sabaean, sabean, screwbean, shahian, shebean, soanian, sofian, spelaean, tabi'un, tarpeian, thomaean, trustee in, typhoean, umziehen, vannguyen, woestijn, wolffian, yulian, zunian

4 syllables:
abyssinian, acarian, adlerian, aeschylean, amoebaean, amphigean, aphidian, apogean, arctogaean, artagnan, asclepeion, bourgeoisie in, byzantian, cabirean, caesarian, calcanean, caribbean, carribean, chalybean, chaucerian, colossean, corantijn, cornopean, cyclopean, cytherean, d'artagnan, daedalean, daguerrean, danubian, dartagnan, desmidian, djiboutian, epigean, eritrean, erythraean, ethician, european, falstaffian, galilaean, galilean, geminian, gilbertian, grammarian, grosswardein, gynecian, harrovian, heracleion, hitlerian, hyblaean, hymenean, hyoidean, hypogean, iguanian, intermean, ituraean, jacobean, jahanian, javabean, jellybean, jiangnan, jinusean, kajkavian, kampuchean, kashmirian, khachigian, kryptonian, larvacean, leguleian, leibnizian, maccabean, macroscian, magdaleon, mambattiyan, manichaean, manichean, marmorean, marowijne, mausolean, melibean, menckenian, messinian, mullerian, muskhogean, muskogean, mycenaean, mycenean, nabataean, nectarean, neogaean, nicotian, north korean, ostracean, panacean, panomphean, pasteurian, pecksniffian, pegasean, philippian, philistian, pompeiian, porphyrian, robert sheehan, ron mckeon, scarabaean, schneiderian, sharifian, sirenian, sisyphean, skinnerian, slovakian, song seung-heon, sorcerian, sotadean, south korean, soyabean, spencerian, spenserian, stigmarian, tartarean, tennessean, tennesseean, tennessee in, tribonian, valkyrian, valkyrien, vergilian, vorhersehen, wallerian, weichselian, wiedersehen, yeniseian

5 syllables:
acoustician, albigensian, arachnidian, asclepiadean, david mckeon, emma mckeon, epicurean, epistolean, esophagean, euripidean, evangelian, gibraltarian, hirudinean, hoabinhian, homosapian, homosapien, infirmarian, inge de bruijn, liverpudlian, maimonidean, natasha lyonne, orosirian, paleogaean, pan-european, pro-european, rembrandt van rijn, robosapien, rozemarijn, sarawakian, solenacean, stelleridean, thalassinian, westrobothnian, wikipedian

6 syllables:
afro-caribbean, anti-european, buddhas of bamiyan, hypocarpogean, indo-caribbean, indo-european, indoeuropean, marsupialian, neogrammarian, universalian

7 syllables:
african-caribbean, pre-indo-european

8 syllables:
pirates of the caribbean, proto-indo-european

3 syllables:
bosnian, chthonian, goethian

4 syllables:
algonkian, iranian, algonquian, cambodian, chelonian, custodian, devonian, dostoevskian, draconian, dystopian, eonian, esthonian, estonian, gorgonian, ionian, laconian, mongolian, napoleon, newtonian, oxonian, plutonian, shoshonean, shoshonian, smithsonian, tyrolean, utopian, zoroastrian

5 syllables:
ceratopsian, mitochondrion, acheronian, anatolian, antinomian, arizonian, babylonian, ethiopian, nickelodeon, oregonian, philibosian, theologian, tobagonian, washingtonian

6 syllables:
czechoslovakian