Dethlefs rhymes with:
ratliffe's, ricklefs, braniff's, josephs, plaintiff's, plaintiffs, plaintiffs', plantiffs, ratliffe's, ricklefs
Dethlefs sounds like:
dalbec, dalpiaz, dealfish, delapaz, delavega, delbosque, delfosse, delfs, dellavecchia, delphax, delphic, delpizzo, delpozo, delvecchio, delves, dilbeck