Sonneborn rhymes with:
colborn, colborne, deerborne, newborn, acorn, bralorne, capricorn, colborn, colborne, deerborne, eichorn, hagadorn, halliciforn, hathorn, hawthorne, heckendorn, kempthorne, langhorn, langhorne, leghorn, newborn, silverthorn, silverthorne
Sonneborn sounds like:
sambrano, san-fran, sanborn, schimberni, schoenborn, sigmaform, sunburn