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, bothnian, 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, 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