Vontobel rhymes with:
chernobyl, coble, doble, ennoble, fobel, global, gobel, goble, goebel, grenoble, ignoble, immobile, knobel, knoble, knoebel, kobel, koble, koebel, lobel, mobil, mobile, noble, robel, roble, schauble, schobel, sobel, sobil, soble, sobol, strobel, stroble, stroebel, wrobel, zobel