Flavius rhymes with:
nevius, silvius, agius, ambrosius, beckius, blasius, brixius, brosius, cornelious, crecelius, dinius, graffius, gurganious, iglesias, junius, lanius, launius, lenius, melius, milius, moebius, nevius, pastorius, pocius, pontius, porteous, redenius, sartorius, silvius, tertius, tullius
Flavius sounds like:
fallback, felps, filipek, filipiak, filipkowski, filipovic, filipowicz, filipski, filofax, flapjack, flapjacks, flaps, flips, flops, flubs, fluffs, fullback, fullbacks