1 syllable:
boy, boye, broy, choi, choix, choy, cloy, coy, coye, croix, croy, deut-, doi, floy, foie, foy, foye, hoi, hoy, hoye, joy, joye, knoy, kroy, loy, loye, moy, moye, neu, oi, oie, oy, oye, ploy, roi, roy, roye, scheu, sgroi, soy, stoy, stroy, toy, toye, troy, woy, yoy

2 syllables:
abloy, abscheu, accloy, accoy, ahoy, alcoy, alloy, alroy, annoy, ball boy, bat boy, baudroie, beachboy, beffroi, bellboy, bellroy, besoi, bok choi, bok choy, bolshoi, borzoi, boxboy, brayboy, busboy, bushboy, calboy, callboy, candroy, carboy, carquois, chamoy, chinmoy, chinois, chinoy, claire foy, cowboy, dalstroy, dayboy, deboy, decoy, dejoy, delroy, deploy, destroy, devroy, digboi, doughboy, ellroy, elroy, emploi, employ, employe, enjoi, enjoy, envoi, estoy, eyetoy, fantroy, farmboy, farm boy, fauntroy, femboy, fermoy, fitzroy, flournoy, gameboy, gilroy, hellboy, henchboy, highboy, hoichoi, homeboy, houseboy, ixoye, joeboy, kagoy, khoikhoi, kill-joy, kilroy, kim-joy, konoye, kouroi, laboy, lacroix, lafoy, lamboy, lavoy, lenvoi, leroi, leroy, lovejoy, malloy, matoi, mccloy, mccoy, mckoy, mcroy, mcvoy, melroy, milroy, mobvoi, monroy, montjoy, montroy, moroi, mountjoy, mulroy, musgoi, mythoi, n-joi, namoi, nesoi, nimoy, nomoi, norroy, northboi, octroi, octroy, old boy, owlboy, pageboy, pak-choi, pakchoi, pakhoi, pithoi, playboy, ploughboy, plowboy, poboy, polloi, pomroy, poor boy, popejoy, psiloi, quemoy, renvoi, rob roy, rocroi, rougecroix, savoy, schoolboy, shamoy, shop boy, spartoi, steamboy, stonebwoy, streymoy, strigoi, suboi, sukhoi, surcloy, synctoy, tallboy, tatsoi, tholoi, toitoi, tolstoi, tolstoy, tomboy, topoi, tsuboi, u-roy, uncoif, vanscoy, ventoy, vickroy, whiteboy, wolf boy, yayoi, zomboy

3 syllables:
aizanoi, albanoi, altar boy, attaboy, backroom boy, ballyvoy, bavaroy, bogazkoy, cabin boy, canticoy, catholicoi, cfroi, charleroi, city boy, college boy, corduroy, cunjevoi, dauphinois, deveroy, diddicoy, didicoy, disemploy, domovoi, domovoy, drummer boy, erminois, errand boy, express joy, eysturoy, fauntleroy, gilderoy, gmroi, golden boy, hoi polloi, honeoye, hors-la-loi, i'itoi, illinois, iroquois, jump for joy, kablooie, kadikoy, kaiapoi, ken mcelroy, kingaroy, lisa joy, littleboy, maccaboy, macintoy, malavoi, malinois, mama's boy, mcavoy, mcelroy, mcevoy, mcilroy, mcinroy, men-yoroi, minicoy, misemploy, mother's boy, nictheroy, niteroi, office boy, omphaloi, oneiroi, overcloy, overjoy, palitoy, polevoi, pomeroy, preemploy, pronephroi, re-employ, real mccoy, redeploy, reemploy, reenjoy, sailor boy, self-destroy, shadertoy, siegfried & roy, sonny boy, stableboy, stanovoi, teddy boy, tinkertoy, unemploy, usdoi, vver-toi, water boy, whipping boy, wonder boy, wood's alloy, xanthochroi, zircaloy

4 syllables:
albert vanhoye, athinganoi, beregovoy, broth of a boy, constantinois, dijon-prenois, frances conroy, grocery boy, helen of troy, james purefoy, kamilaroi, kevin conroy, khalkotauroi, kolomenskoye, leo tolstoy, mackenzie foy, mafiaboy, melanochroi, mesonephroi, messenger boy, metanephroi, nickel alloy, the kid laroi, traveler's joy, turkana boy, underemploy

5 syllables:
andrey zamkovoy, delivery boy, elevator boy, my little old boy, rory mcilroy

6 syllables:
anya taylor-joy, bell uh-1 iroquois, certified lover boy, seeyouspacecowboy

7 syllables:
capital of illinois

2 syllables:
envoy