Estonia rhymes with:
gastonia, antonia, gastonia, latonia, tonia, adonia, amazonia, ansonia, antonia, caledonia, colonia, cydonia, diaphonia, donia, gastonia, gonia, harmonia, idonia, latonia, macedonia, madonia, new-caledonia, omonia, patagonia, petronia, philharmonia, rondonia, sidonia, sinfonia, slavonia, slovonia, sophronia, tonia, vernonia, vidonia
Estonia sounds like:
eastham, eastin, eastman, easton, echidna, eckstein, ecosystem, ecton, eighteen, ejection, equation, equitation, estan, esteem, estonian, exaction, excitation, execution, executone, exhaustion, exton, eyestone