2 syllables:
brian, brien, brion, bryan, bryen, bryon, buyan, cryan, cryin', dian, dion, flyone, gaian, guyon, gwion, heian, huayan, huyen, hyun, ion, kayan, kayane, keihin, leihen, lionne, lyon, maian, mayan, mion, naion, paien, pryan, psion, quien, raion, rhian, rion, ryan, ryen, ryon, schneien, schreien, scion, skien, thion, tiein, tryin', tryon, wian, wion, wyan, zeien, zion

3 syllables:
achaian, aimyon, akbayan, alion, altaian, ant-lion, aryen, befreien, bisayan, bruneian, cagayan, cairnryan, cantion, chongryon, dacryon, denyen, dicyan, eupryion, euryon, geryon, ghanaian, hawaiian, ixion, johyun, karyon, kedayan, li-ion, mauryan, mcbrien, melion, nvryan, o'brian, o'brien, o'bryan, obrian, obrien, obryan, olayan, ophryon, orion, procyon, sablayan, tropaion, tylion, vinayan, visayan

4 syllables:
alectryon, amphitryon, anakbayan, anthelion, anthocyan, caesarion, censorian, chippewaian, condylion, coppelion, dactylion, dandelion, dikaryon, erechtheion, gerontion, gorgoneion, hellenian, herakleion, herodian, herodion, himalayan, innereien, longyearbyen, mesophryon, micoquien, oenocyan, padelion, paraguayan, pommelion, prosodian, prytaneion, pyrocyon, seohyun, signifyin, synkaryon, triskelion, urocyon, uruguayan, xenocyon, xiphoidian

5 syllables:
amphikaryon, antibaryon, evangelion, hemikaryon, hippalectryon, olonkinbyen, perikaryon, sandiganbayan

6 syllables:
heterokaryon