Jonassen rhymes with:
hannesson, magnuson, magnussen, magnusson, monessen, unison, venison, acheson, addison, allison, amason, andreassen, comparison, dickason, diocesan, eliason, eliassen, fergason, fergeson, ferguson, fergusson, furgason, genemedicine, grieveson, hannesson, higgason, iason, jesudason, liason, liasson, madison, magnuson, magnussen, magnusson, marcussen, markuson, matheson, mathiasen, mathiason, medicine, monessen, myosin, niacin, nicoson, ottoson, oveson, purgason, radisson, rasmuson, rasmussen, rasmusson, thomason, thomassen, thomasson, tobiason, unison, vargason, venison
Jonassen sounds like:
jainism, jamaican, jameson, jamieson, jamison, jansen, jansma, janson, janssen, jansson, janzen, jeansonne, jemison, jenison, jenkin, jennison, jensen, jenson, jenssen, jimison, jingoism, johannesen, johannessen, johannsen, johansen, johanson, johansson, johnsen, johnson, jonsman, jonson, jonsson, jungin, jungman, junkin, junwuxiyan