Sebastiani rhymes with:
cristiani, cristiani, bisiani, cipriani, cristiani, damiani, fabiani, frediani, giuliani, graziani, guiliani, ianni, mariani, mastrianni, modigliani, notarianni, ottaviani, satriani, sirianni, spaziani, viani, viviani
Sebastiani sounds like:
savastano, sebastian, sebastiana, sebastiane, subsection, substation, substitution, subsystem, suffocation, supposition