Niall rhymes with:
nile, aisle, argyll, awhile, beguile, bile, bille, cheil, compile, deihl, delisle, file, geil, gile, gille, guile, heil, hile, hyle, i'll, isle, kile, kurzweil, kyl, kyle, lile, lyle, marseille, mile, monteil, nevile, nile, panfile, pfeil, phyle, pile, pyle, refile, reihl, restyle, revile, rile, ruyle, ryle, seil, sheil, smile, soleil, stile, style, theil, theile, tile, vantuyl, vile, weil, weill, while, wile, worthwhile, wyle, zile
Niall sounds like:
nail, naill, nale, nall, nalley, nally, namely, neal, neala, neale, nealey, neall, nealy, neel, neeley, neely, neil, neile, neill, nel, nela, nelia, nell, nella, nelle, nelli, nellie, nelly, neola, newall, newell, newhall, newill, newley, newly, nial, niel, niemela, nil, nila, nile, nill, nilly, noel, noell, noelle, nohl, nola, nole, nolie, noll, nolla, nolley, nollie, nolo, nominal, nominally, nowell, noyola, nuala, null, nunley, nunnally, nunnelley, nunnelly