Silvius rhymes with:
flavius, nevius, agius, ambrosius, beckius, blasius, brixius, brosius, cornelious, crecelius, dinius, flavius, graffius, gurganious, iglesias, junius, lanius, launius, lenius, melius, milius, moebius, nevius, pastorius, pocius, pontius, porteous, redenius, sartorius, tertius, tullius
Silvius 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, 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, sylvio's