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