Upson rhymes with:
dopson, empson, epson, gipson, hampson, hopson, impson, ipsen, jeppson, jepsen, jepson, jipson, kempson, lampson, lipson, papson, philipson, phillipson, rapson, rhodopsin, sampson, simpson, stimpson, sympson, thompsen, thompson, timpson, tompson