Willemsen rhymes with:
clemson, clemson, remsen, remson, abrahamsen, abrahamson, abramson, adamson, bramson, clemson, damson, flamson, hamson, harmsen, hermsen, jameson, lambson, lamson, malcolmson, malcomson, remsen, remson, rimson, rumson, samson, siemsen, simson, stimson, thomsen, thomson, timson, tomson, wilhelmsen, williamsen, williamson
Willemsen sounds like:
wilhelmsen, williamsen, williamson, willingham