Sebastianis rhymes with:
cristiani's, cristiani's, cristiani's, giuliani's, albani's, azerbaijanis, bonnie's, cristiani's, danis, g'vanni's, giovanni's, giuliani's, johnnie's, johnny's, teherani's, teheranis, tehrani's, tehranis
Sebastianis sounds like:
scapegoating, sebastian's, subjecting, subsidence, subsiding, subsistence, substance, substances, substituting, substitutions, subsystems, suffocating, suppositions, suspecting