Sellars's rhymes with:
distillers's, akers's, askers's, bofors's, brothers's, calpers's, carriers's, chambers's, distillers's, elders's, farmers's, fedders's, myers's, reuters's, rogers's, sanders's, saunders's, summers's
Sellars's sounds like:
sailor's, sailors, sailors', salaries, salyers, saylors, schiller's, scholar's, scholars, schoolers, schoolwork, sclerosis, sellars, seller's, sellers, sellers', sizzlers, skylark, skylarks, slorc, slurs, solares, solaris, solarz, sollars, sollers