Sylvio's rhymes with:
davio's, baggio's, berlioz, collosio's, colosio's, curios, daddy-o's, davio's, defterios, eugenio's, florio's, horatio's, ignacio's, mario's, ontario's, rubios, scenarios, silvadio's, trafillio's, video's, videos
Sylvio's sounds like:
sailfish, salopek, salvage, salvaggio, salvas, salves, salvi's, salvos, salvucci, scallops, scalps, schlabach, schoolbook, schoolbooks, schoolboys, schoolbus, schulhaufs, schwalbach, seawolf's, seelbach, self's, selfish, selfs, selloffs, selvage, selvaggio, selves, selvig, shelby's, shellfish, shelves, silbaugh, silfies, silva's, silvas, silvis, silvius, slabaugh, slabs, slaps, slaves, slavic, slavick, slavik, slavish, slavs, slayback, slaybaugh, sleeps, sleeves, slifka, slifko, slippage, slips, slivka, slobs, slopes, slovacek, slovak, slovakia, slovakia's, slovaks, sloves, slowpoke, slupic, solves, solvig, syllabic, syllabus, sylvia's