Pettersson rhymes with:
petersen, peterson, petersen, peterson, batterson, brodersohn, catterson, chesterson, kesterson, masterson, otterson, paterson, patterson, petersen, peterson, pettersen, petterson, waterson
Pettersson sounds like:
paterson, patrician, patterson, pedersen, pederson, pediatrician, peterkin, petersen, peterson, petrosino, petrossian, pettersen, petterson